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8th Grade Math (Math 8) · Chapter 10 · Lesson 10.3 · Printable PDF

Triangle Angle Sum Worksheet with Answer Key

7 problems on the triangle angle sum: finding the third angle, deciding if angles can form a triangle, a tent pole and guy rope, isosceles triangles, exterior angles, an angle bisector, and whole-number angles. 2 pages, with a worked answer key.

7 problems2 pagesanswer key
Printable Triangle angle sum worksheet with answer key - 8th Grade Math (Math 8) (Page 1 PDF preview)
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Try one first: a free Chapter 1 worksheet (PDF, no sign-in).

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What's on the worksheet

  1. Find the third angle and say if the triangle is acute, right or obtuse:
    38° and 76°27° and 63°19° and 44°55° and 55°88° and 3°
  2. Decide yes or no if three measures can be the angles of one triangle:
    72°, 54°, 54°95°, 60°, 35°30°, 30°, 30°120°, 31°, 29°61°, 62°, 58°
  3. Word problem: angles of a tent pole and its guy rope on level ground.
  4. Find the three angles of an isosceles triangle from its vertex angle.
  5. Find angles using an exterior angle that is 3 times an angle of the triangle.
  6. Find angles formed by a ray that bisects the right angle of a triangle.
  7. Find limits on the angles of a triangle with unequal whole-number angles.

Teach it first

The free lesson teaches it with worked examples and practice problems.

Triangle angle sum: the lesson ›

More Chapter 10 worksheets: Parallel lines, transversals and the triangle sum