Middle School Level Questions on Triangles
from the Dr. Math Archives

Middle School Dr. Math Questions on Measurement
Below are some questions and answers from our archive of questions sent via e-mail by K12 students and teachers to Ask Dr. Math. You may also browse the entire middle school level archive by category.


Angle, Side Length of a Triangle
What is the relation between the angles and side lengths of a triangle?
Area: Triangle vs. Rectangle
Why is the formula for the area of a triangle different from that of a rectangle or square?
Calculating the Sides of a Right Triangle
I need help on how to calculate the length of the opposite side of a right triangle if the length of the adjacent and angles are known.
Perimeter Equals Area in a Triangle
When will the area and perimeter of a right triangle be numerically equal?
Right Triangles
Is there an easy way to remember the different right triangles and how to find the length of missing sides? I already know that in any right triangle: (a*a) + (b*b) = (c*c).
Triangles: Height and Angle
A tree casts a shadow 30 ft and makes an angle of 47 degrees with the ground. How high is the tree?
Why do the angles of a triangle add to 180 degrees?
We were wondering why all the angles in a triangle add up to 180 degrees.
Teaching Area of Triangles
When I gave a Unit Assessment, all but one student got area of a triangle wrong. Where did I fail?
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Mara Landers

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