A right triangle has legs of 8 and 15 units. How long is the hypotenuse?

Answer and explanation

Correct answer: D. 17

  1. Step 1: c squared = 8 squared + 15 squared = 289. Step 2. c = 17. Answer: 17. Why not the others: 23: this adds the legs instead of using the Pythagorean theorem. 289: this is the square of the hypotenuse; the square root was not taken. 7: this subtracts the legs.

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