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What Kind of Triangle? is a free printable Grade 4 math worksheet on naming a triangle from its largest angle, aligned to Common Core standard 4.G.A.2. It prints 9 questions with an answer key on its own sheet of paper, in 25 versions that each ask different questions, so no two students in the class work from the same page. Print it from the browser or download it as a PDF — no account, no email.

Set 13 of 25 · the same problems every time you open this link.

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Set 1 has all 25 in a single PDF. All 25 sets ask different questions.

What Kind of Triangle?

4.G.A.2

NameDate

Write acute, right or obtuse.

1.A triangle has angles of 40°, 70° and 70°. Is it acute, right or obtuse?
2.A triangle has angles of 85°, 55° and 40°. Is it acute, right or obtuse?
3.A triangle has angles of 15°, 35° and 130°. Is it acute, right or obtuse?
4.A triangle has angles of 15°, 15° and 150°. Is it acute, right or obtuse?
5.A triangle has angles of 65°, 90° and 25°. Is it acute, right or obtuse?
6.A triangle has angles of 50°, 70° and 60°. Is it acute, right or obtuse?
7.A triangle has angles of 10°, 5° and 165°. Is it acute, right or obtuse?
8.A triangle has angles of 60°, 85° and 35°. Is it acute, right or obtuse?
9.A triangle has angles of 120°, 30° and 30°. Is it acute, right or obtuse?

LessonPrint · 4.G.A.2 · Set 13 · free to copy for classroom use

Answer key — What Kind of Triangle?

Set 13. Prints on its own sheet.

  1. 1.acute
  2. 2.acute
  3. 3.obtuse
  4. 4.obtuse
  5. 5.right
  6. 6.acute
  7. 7.obtuse
  8. 8.acute
  9. 9.obtuse

Last reviewed 2026-09-05. Aligned to 4.G.A.2 of the Common Core State Standards for Mathematics.