Skills · Trigonometry · Right Triangles & Trigonometry

Is it a right triangle?

Printable practice with an answer key the engine computes, at three levels, in as many versions as you need.

Problem types

Sample Sheet · Level 1

  1. Can 15, 20 and 25 be the sides of a right triangle?
  2. Can 18, 23 and 30 be the sides of a right triangle?
  3. Can 7, 8 and 10 be the sides of a right triangle?
  4. Can 8, 15 and 17 be the sides of a right triangle?
  5. Can 20, 21 and 29 be the sides of a right triangle?
  6. Can 12, 16 and 20 be the sides of a right triangle?
  7. Can 10, 12 and 15 be the sides of a right triangle?
  8. Can 20, 24 and 30 be the sides of a right triangle?

Answer key

  1. yes
  2. no
  3. no
  4. yes
  5. yes
  6. yes
  7. no
  8. no

Sample Sheet · Level 3

  1. A triangle has sides 16, 30 and 35. Is it acute, right or obtuse?
  2. A triangle has sides 45, 51 and 26. Is it acute, right or obtuse?
  3. A triangle has sides 40, 32 and 24. Is it acute, right or obtuse?
  4. A triangle has sides 4, 4 and 5. Is it acute, right or obtuse?
  5. A triangle has sides 20, 25 and 15. Is it acute, right or obtuse?
  6. A triangle has sides 3, 3 and 4. Is it acute, right or obtuse?
  7. A triangle has sides 6, 6 and 10. Is it acute, right or obtuse?
  8. A triangle has sides 19, 28 and 35. Is it acute, right or obtuse?

Answer key

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

Make your own

Pick the count, the level and the version, and print it with work space and the key on its own page. The same skill also makes an I Do, We Do, You Do lesson, a Mosaic, a Decoder and more.

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