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| Answers More on Triangles | Label Angles and Triangles | More Label Me! printouts | 
| acute angle - an angle that is less than 90°. equilateral triangle - a triangle whose sides are all the same length. isosceles triangle - a triangle that has two sides the same length (and two angles the same). obtuse angle - an angle that is greater than 90°. | right angle - an angle that measures exactly 90°. right triangle - a triangle that has one interior angle that is exactly 90°. Note, some right triangles are also scalene triangles. scalene triangle - a triangle whose sides are all different lengths. Note, some scalene triangles are also right triangles. straight angle - an angle that measures 180°. | 
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