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MissPhiladelphia
We are given a right triangle so that we can use the Pythagorean Theorem to solve for the measurement of the other leg. We use the expression written as:

c² = a² + b²

where c is the hypotenuse, a and b the other legs.

153² = 72² +b²
18225 = b²
b = 135 cm

Hope this answers the question. Have a nice day.
the answer is b= 135cm

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