hi how do u ask a question
Answer:
16 cm
Explanation:
i would use the pythagorean theorem:
find the sum of the square of the legs and set that equal to the square of the hypotenuse
a² + 12² = 20²
a² + 144 = 400
subtract 144 from each side:
a² = 256
a = √256
a = 16
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