Question

Which of the following are right triangles
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Answer 1

Triangle GHI

Explanation:

If a triangle is a right triangle then it will obey Pythagoras' theorem:

c^2 = a^2 + b^2.

Triangle GHI is a right triangle as

15^2 = 9^2 + 12^2

225 = 81 + 144

225 - 225