Equilateral and Isosceles Triangles and Exterior Angles
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Equilateral and Isosceles Triangles and Exterior Angles
Triangle and polygon angles worksheet for Grades 6 and 7: the 60° angles of an equilateral triangle, base and top angles of isosceles triangles, and exterior angles of polygons, which add to 360°, regular ones included. With an answer key.
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- Pages
- 1
- Last updated
- Time
- About 15 minutes
- Answer key
- Included
- Printing
- Black and white
- Related curriculum
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Use the angle sum of a triangle, exterior angles, and the angles made when a line crosses two parallel lines to find missing angles.
Reviewed by Mr. Daniel Carter, Teacher. How we check worksheets
How to use this sheet
- Have the child mark the angles that are equal on the diagram before working anything out.
- Write the relationship as an equation, such as x + 65 = 180, before solving.
- For triangle sides, have the child add the two shorter sides and compare with the longest.
Common mistakes
- Mixing up complementary (90 degrees) and supplementary (180 degrees). Supplementary angles make a straight line.
- Assuming angles are equal because they look equal. Use the relationships, not the look.
- For triangle sides, checking only one pair. The two shorter sides together must be longer than the longest side.
