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 TOPICS This page:   two-dimensional  geometry    Search   Dr. Math See also the Dr. Math FAQ:   geometric formulas and   naming polygons   and polyhedra Internet Library:   Euclidean/plane   geometry MIDDLE SCHOOL About Math Algebra    equations    factoring expressions    graphing equations Arithmetic    division    exponents    factorials    factoring numbers    fractions/percents    logarithms Definitions Geometry    2-dimensional      conic sections/        circles      triangles/polygons    3D and higher      polyhedra History/Biography Logic Measurement    calendars/      dates/time    temperature    terms/units Number Sense    factoring numbers    negative numbers    pi    prime numbers    square roots Probability Puzzles Ratio/Proportion Statistics Word Problems Browse Middle School Two-Dimensional Geometry Stars indicate particularly interesting answers or good places to begin browsing. Selected answers to common questions:     Classifying quadrilaterals.     Pythagorean theorem proofs. Area and Perimeter [05/01/2001] I do not understand area and perimeter - can you explain them? Area and Volume [04/10/2002] I cannot figure out how to do volume. Explementary Angles [05/29/2003] What do we call two angles that add up to 360 degrees? Find Equation for Two Points [12/12/2002] I want to know how to find an equation for two given coordinate points. Finding Areas using Unit Conversions [3/19/1996] How do you calculate area, expressed in English units? For example: how do you calculate the area of a rectangle, where one side is, say, 2 miles, 3 furlongs, 4 yards, 2 feet and 5 inches...? How to Measure Angles [04/19/1998] How do you measure angles? What are degrees and radians? Measuring Angles with a Protractor [02/28/2002] I want to know how to measure acute, reflex and obtuse angles with a protractor. Painting Cubes [01/06/2003] How many unit cubes would be needed to create a cube with a side length of 3 units? If you painted the larger cube and broke it up into unit cubes, how many faces of each unit cube would be painted? Remembering Area Formulas [12/23/2001] Is there was a good way to help me memorize the formulas for areas of different shapes? Turning a Perimeter into a Scale Factor [02/17/2003] Perimeter and area ratios of similar figures are given. Find each scale factor. Using a Protractor [06/28/1998] How do you construct two parallel lines and intersect them making a 65-degree angle? A 14-Sided Polygon [7/28/1996] What is the proper name for a 14-sided figure? 2 Square Feet vs. 2 Feet Square [11/22/1998] What is the difference between 2 square feet and 2 feet square? About Basic Geometry [10/14/1998] Who developed basic geometry? What is it used for? Who uses it? Abraham Kaestner and Euclid's Fifth (Parallel) Postulate [12/02/1996] Where can I find information on Abraham Kaestner? Adjacent Angles [09/19/2001] What is the definition of adjacent angles? The Algebra of Complements and Supplements [01/25/1999] What are complements and supplements? How do you translate these concepts into algebra? Alternate and Corresponding Angles [10/21/1996] Please explain corresponding and alternate angles. Alternate Exterior Angles [06/03/2002] What is an 'alternate exterior angle'? Angles: Acute, Right, Obtuse, Reflex [06/06/2001] How can I remember what the names of angles mean? Angles as Turns [05/29/2003] How can angles be negative? Angles Greater than 360 Degrees [01/01/1999] We know the definitions of acute, obtuse, and reflex angles, but we were debating what kind of angle a 425 degree angle is. Angle, Side Length of a Triangle [9/4/1996] What is the relation between the angles and side lengths of a triangle? Angles in a Diagram [10/14/1998] In a diagram with perpendicular, parallel, and transversal lines, how can you find the measure of the angles given the measure of one angle? Angles of Stars [08/18/1997] What are the interior and external angles of stars built on regular pentagons and octagons. Area and Perimeter [10/4/1995] I have a problem with finding area and perimeter - can you help me? Area and Perimeter: Mowing the Lawn [6/1/1996] How many circuits are necessary to cut half the lawn? Area Larger Than Perimeter? [04/15/2002] Can the area of a shape be larger than the perimeter? Are Angles Dimensionless? [08/31/2003] If you look at the dimensions in the equation arc length = r*theta, it appears that angles must be dimensionless. But this can't be right. Or can it? Area of a Circle with Radius less than 1 [02/18/2002] If the radius is less than 1 it just gets smaller and you get a smaller area... Area of an Irregular Polygon [03/29/2001] How can I find the area of an irregular polygon? What about a polygon made out of rectangles? Area of an L [07/10/2003] How do you find the area of an 'L' shaped object? Area of a Rectangle Outside a Rectangle [6/11/1996] Find the area of the concrete border of a rectangular swimming pool. Areas of Figures Broken into Rectangles [10/17/2001] Calculate the area of each figure. First divide the figure into rectangles and squares... Area, Surface Area, and Volume: How to Tell One Formula from Another [01/18/1999] Unit dimensions -- and even an idea from calculus -- can tell you which formula you're using. Area: Triangle vs. Rectangle [4/30/1996] Why do you have to use a different formula to get the area of a triangle than a rectangle or square? Area vs. Perimeter of Rectangles [03/19/2000] Can you explain how two rectangles with exactly the same perimeter can enclose different areas? Arrange 7 Points in a Plane... [10/05/1998] Arrange 7 points in a plane so that if any three are chosen, at least 2 of them will be a unit distance apart. Building Two Column Proofs [09/12/1998] We just started learning proofs, and I don't understand how to figure out the ordering. Can you explain? Circle Area and Square Units [11/12/1997] Is pi metres squared the same as 10,000 pi centimetres squared? Does a square with sides of 10m have an area of 10m squared or 100 square metres - or are these the same? Page:  1  2  3  4  5 [next>]

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