A right triangle has legs of 9 and 12 units. How long is the hypotenuse?

Answer and explanation

Correct answer: B. 15

  1. Step 1: c squared = 9 squared + 12 squared = 225. Step 2. c = 15. Answer: 15. Why not the others: 21: this adds the legs instead of using the Pythagorean theorem. 225: this is the square of the hypotenuse; the square root was not taken. 3: this subtracts the legs.

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