RT a-b-x

There is a right triangle with legs long a, b, and hypotenuse long x. Given that a = 6 cm and b = 9 cm, work out x.
Give your answer as an exact surd.

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You need to know the following knowledge to solve this word math problem:

arithmetic

square root

planimetry

Pythagorean theorem
right triangle

Grade of the word problem

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