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Home / A right triangle has legs of 9 cm and 12 cm. What is the length of the hypotenuse?

A right triangle has legs of 9 cm and 12 cm. What is the length of the hypotenuse?

February 22, 2026

A right triangle has legs of 9 cm and 12 cm. What is the length of the hypotenuse?

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\(r^2 = \frac{144}{4} = 36\)
Find \(r\):
\(r = \sqrt{36} = 6\) cm
\(c = \sqrt{9^2 + 12^2} = \sqrt{81 + 144} = \sqrt{225} = 15\) cm
A circle has a circumference of \(62.8\) cm. What is its radius? (Use \(\pi \approx 3.14\))
Use the circumference formula:

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