Practice Triangles in Math
Use these practice problems to test your method after reviewing the concept explanation and worked examples.
Quick Recap
A polygon with exactly three sides and three interior angles that always sum to exactly 180 degrees.
The simplest polygon—you need at least 3 sides to enclose space.
Example 1
easyTwo angles of a triangle measure 50° and 65°. Find the third angle.
Example 2
mediumClassify the triangle with sides 5 cm, 5 cm, and 8 cm by its sides and determine whether it is acute, right, or obtuse.
Example 3
easyAn equilateral triangle has a perimeter of 36 cm. Find the length of each side.
Example 4
mediumThe three angles of a triangle are in the ratio 2:3:4. Find the measure of each angle.