A right triangle has legs of length 9 and 12. What is its perimeter?

Answer and explanation

Correct answer: C.

  1. Step 1: By the Pythagorean theorem the hypotenuse is . Step 2. Add all three sides: . **Answer: . Why not the others:** leaves out the hypotenuse, is the area of the triangle, and counts the hypotenuse twice and ignores the legs.

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