Math Forum - Problems Library - Geometry - Right Triangles

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Right Triangles
Problems in this category can be solved using the Pythagorean theorem, special right triangles, or right triangle trigonometry, and are not, for the most part, included in the more general triangle category.

You can also get a list of problems in the following subcategories:

Related Resources
Interactive resources from our Math Tools project:
   Geometry: Right Triangles
The closest match in our Ask Dr. Math archives:
   High School: Triangles
NCTM Standards:
   Geometry Standard for Grades 9-12

Access to these problems requires a Membership.

Ants Marching - Annie Fetter
Geometry, difficulty level 2. Traveling along the edges of a cross section of the cube, find the length of the shortest possible path from one corner of a cube to the opposite corner, as well as the longest possible path between the same corners. ... more>>

Arc to Area - Annie Fetter
Geometry, difficulty level 4. Given an arc with a measure of 40 degrees whose endpoints are at (1,5) and (5,3), find the area of the circle that contains the arc. ... more>>

Area of a Rectangle - Annie Fetter
Geometry, difficulty level 2. Given rectangle ABCD with point E on CD. AE is 3, BE is 4, and AE is perpendicular to BE. What's the area of ABCD? ... more>>

As Far as the Eye Can See - Annie Fetter
Geometry, difficulty level 4. If I'm 5'10" tall, can I see the entire length of Lake Memphramagog, which is about 23 miles long? ... more>>

Boxing Up Harry's Broom - Annie Fetter
Geometry, difficulty level 1. Help Harry find the right size box for his broom. ... more>>

Building a Dog Enclosure - Annie Fetter
Geometry, difficulty level 3. Two people are arguing about whether three sections of fencing 6, 8, and 10 feet long will enclose more or less area than three sections 6, 8, and 12 feet long. ... more>>

Building a Regular Hexagon - Annie Fetter and Steve Weimar
Geometry, difficulty level 3. How do you form a regular hexagon by attaching rectangles to the sides of an equilateral triangle? ... more>>

Building a Vaulted Ceiling - Annie Fetter
Geometry, difficulty level 4. An eyebrow window is a 15-inch-deep slice off an 8.5-foot circle. How wide will the base of the window be? ... more>>

Building Bookshelves - Steve Weimar
Geometry, difficulty level 2. Merriem and Emmanuel's new bookshelf hits the ceiling when they try to put it in place. Explain why, and help them figure out how much to cut off the bottom so that it will fit. ... more>>

Calculating String Length - Annie Fetter
Geometry, difficulty level 2. Given the archery targets of two competitors, figure out which one has the shortest 'string length'. ... more>>

Checking a Building Foundation for Square - Annie Fetter
Geometry, difficulty level 2. How can you determine whether a rectangle is square when all you have is string and a tape measure? ... more>>

A Circle Inscribed in an Isosceles Triangle - Ilmar Vitsut
Geometry, difficulty level 4. Find the radius of a circle inscribed in an isosceles triangle with sides 12, 12, and 8. ... more>>

The Corner Banking of the Daytona Speedway - Annie Fetter
Geometry, difficulty level 2. Compare the corner banking at the Daytona Speedway, which is 31 degrees, with the roof on the house and garage that I helped build. ... more>>

Diagonal Dilemma - Karen Cohen
Geometry, difficulty level 1. What is the area of the square ABCD that has a diagonal of length 12 cm? ... more>>

The Dimensions of a Hunting Platform - Annie Fetter
Geometry, difficulty level 2. I have a picture of a hunting platform, and I need help figuring out some of the dimensions. ... more>>

Drawing a Kite Plan - Annie Fetter
Geometry, difficulty level 3. Given a picture of a kite plan, figure out the radius of the circle that creates the curved section. ... more>>

Dueling Spheres - Annie Fetter
Geometry, difficulty level 2. You're given two spheres with centers 14 cm apart. The circumference of the circle where they intersect is 24 pi cm, and the radius of one sphere is 13 cm. What's the radius of the other sphere? ... more>>

Equilateral Triangle and Square Ratio - Dale Pearson
Geometry, difficulty level 3. A square with side length s is inscribed in an equilateral triangle of side length t. Find the ratio t/s. ... more>>

Examining an Octagon - Annie Fetter
Geometry, difficulty level 3. Describe the rectangles that you would need to put on the sides of a square in order to be able to end up with a regular octagon when you connect the outside vertices of the figure. ... more>>

Field of View - Annie Fetter
Geometry, difficulty level 2. Figure out the field of view for two different pairs of binoculars. ... more>>

Finding the Base of a Trapezoid - Annie Fetter
Geometry, difficulty level 3. Given trapezoid ABCD, with AD one base and BC the other and a 60 degree angle at CDA. If CD is 26sqrt3/3 meters, BC is 7 meters, and the area of the trapezoid is 130 square meters, what's the length of AD? ... more>>

Flying High - Annie Fetter
Geometry, difficulty level 1. Figure out which of two planes is gaining altitude more quickly. ... more>>

Folding a Rectangle - Annie Fetter
Geometry, difficulty level 3. Fold a 6-inch by 8-inch piece of paper so that the opposite corners meet. How long is the fold? ... more>>

Geoboard Gymnastics - Annie Fetter
Geometry, difficulty level 3. Find squares with different areas on a geoboard. ... more>>

An Inscribed Circle - Annie Fetter
Geometry, difficulty level 2. A circle is inscribed in a triangle with sides of 6, 6, and 4. What's the radius of the circle? ... more>>

Jill and Jimmy - Soap Bubbles - Annie Fetter
Geometry, difficulty level 3. You're given two spheres with centers 14 cm apart. If the two spheres intersect in a circle whose radius is 12 cm, and the radius of one sphere is 13 cm, what's the radius of the other sphere? ... more>>

Leaning Ladder - Annie Fetter
Geometry, difficulty level 3. A ladder is leaning against a wall. Explore what happens to the top of the ladder when the bottom is moved closer or further from the wall. ... more>>

The Length of a Belt - Annie Fetter
Geometry, difficulty level 3. The diameters of two wheels are 18 cm and 12 cm and their centers are 30 cm apart. A belt goes around them and crosses 18 cm from the center of the big wheel. How long is the belt? How do you know you're right? ... more>>

Mad About Medians? - Annie Fetter
Geometry, difficulty level 3. The medians drawn from the vertices of the acute angles of a right triangle are 5 and sq root of 40. What is the length of the hypotenuse? ... more>>

Measuring the Matterhorn - Annie Fetter
Geometry, difficulty level 2. Use some right triangle trigonometry to calculate the height of the Matterhorn at Disneyland. ... more>>

A Minor Arc Subtended by a What?? - Annie Fetter
Geometry, difficulty level 2. A chord of a circle is the hypotenuse of an isosceles right triangle whose legs are radii of the circle. The length of the chord is 6 times the square root of 2. What is the length of the minor arc subtended by the chord? ... more>>

More Tangents! - Annie Fetter
Geometry, difficulty level 3. Given a square ABCD inscribed in a unit circle. AB is extended to P, where PC is tangent to the circle. Find the length of PD. ... more>>

Nautical Navigation - Annie Fetter
Geometry, difficulty level 2. Help the sailors of the Kaleidoscope figure out what time they'll pass the lighthouse and how far from the lighthouse they'll be at that time. ... more>>

Olympic Softball - Annie Fetter
Geometry, difficulty level 2. Should the pitcher's rubber in Olympic softball be behind the line drawn from third base to first base, or in front of it? ... more>>

The Perimeter of an Octagon - Annie Fetter, with thanks to the Texas Education Agency
Geometry, difficulty level 3. What's wrong with this picture of a regular octagon? Can you fix what's wrong and find the perimeter? ... more>>

A Picturesque Pythgorean Proof - Annie Fetter
Geometry, difficulty level 3. Write a proof to go with this picture. ... more>>

Pisa's Lean - Annie Fetter
Geometry, difficulty level 4. Explore the angle and distance at which the Leaning Tower of Pisa actually leans. ... more>>

Pythagorean Circles - Lillian Ray
Geometry, difficulty level 3. Figure out the relationship between the area of three regions in this construction of "Pythagorean circles". ... more>>

A Quickie Triangle Puzzle - Sasha Sokolsky
Geometry, difficulty level 2. Find the length of the unknown side of this triangle using knowledge of special right triangles. ... more>>

Sighting in a Rifle - Annie Fetter
Geometry, difficulty level 3. Analyze the given target of four shots, and tell me how far to move the scope on my rifle so that the group of shots will be centered around the bull's-eye. ... more>>

Slicing a Cube - Annie Fetter
Geometry, difficulty level 3. Given a cube with a surface area of 54 cm^2, find the perimeter of the square cross section and that of the largest rectangular cross section of that cube. ... more>>

Snail's Trail - Annie Fetter, Lillian Ray
Geometry, difficulty level 2. What should be the dimensions of the smallest piece of my "Snail's Trail" quilt? ... more>>

The Speed Skating Oval - Annie Fetter
Geometry, difficulty level 2. Find the radii of the turns of a 400 meter speed skating oval. ... more>>

Spring Up, Fall Back - Annie Fetter
Geometry, difficulty level 2. Help build a new rail for these solar panels so that they can be set at three different angles. ... more>>

Steam Up! - Annie Fetter
Geometry, difficulty level 3. Calculating the grade of an incline and the length of a train. ... more>>

The Subtending Chord - Annie Fetter
Geometry, difficulty level 3. A chord of a circle is the hypotenuse of an isosceles right triangle whose legs are radii of the circle. The length of the chord is 8 times the square root of 2. What is the length of the minor arc subtended by the chord? ... more>>

Taking Pictures of the Earth - Annie Fetter
Geometry, difficulty level 4. If you wanted to go out into space and take a picture of the earth, how far from the earth would you have to go to make sure that you got 1/4 of the equator in your picture? How about 1/3? ... more>>

Talladega Afternoons - Annie Fetter
Geometry, difficulty level 1. Compare the corner banking of a track to the steepness of the roof of a house. ... more>>

A Tangent Square and Circle - Reza Kassai
Geometry, difficulty level 3. The square and circle below are tangent at one point and meet at four other points, as shown in the picture. If the side of the square is 8 units long, what's the radius of the circle? ... more>>

TV Dimensions - Annie Fetter
Geometry, difficulty level 2. If the aspect ratio of a TV is 16:9 and the diagonal measures 50 inches, what are the dimensions of the screen? ... more>>

Two Houses and a Carrier Pigeon - Annie Fetter
Geometry, difficulty level 3. One house is 300 yards from a highway. 1200 yards down the highway is the driveway to another house, 600 yards from the highway, on the same side of the road. What is the shortest distance between the two houses if you go to the highway in between? ... more>>

What Do We Know About Tangents? - Annie Fetter
Geometry, difficulty level 2. Given two externally tangent congruent circles, construct a segment from the center of one circle tangent to the other circle. If the length of this segment is 10, what's the radius of the circles? ... more>>

Who Wants to be an Archery Champion? - Annie Fetter
Geometry, difficulty level 2. To determine the winner, calculate the "string length" for each of two archery rounds. ... more>>

World Series Snafu? - Annie Fetter
Geometry, difficulty level 2. Determine what's wrong with the "official" dimensions of "home plate" in baseball. ... more>>

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