The hypotenuse is 11.40.
You need to apply the Pythagorean theorem:
Recall the formula a² + b² = c², where a, and b are the legs and c is the hypotenuse.
Put the length of the legs into the formula: 7² + 9² = c².
Squaring gives 49 + 81 = c². That is, c² = 150.
Taking the square root, we obtain c = 11.40. You can verify the result with an online Pythagorean theorem calculator.
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