need formula to find each leg length of triangle?

Question

hypotonuse=66 1st leg=38 whats the other length?

Answer 1

Pythagorean Theorem

c² = a² + b²

c² - a² = b²

66² - 38² = b²

4356 - 1444 = b²

2912 = b²

√2912 = √b²

53.96295025 = b

The answer is b = 53.96295025

The other leg is 53.96 rounded to two decimal places.

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Answer 2

Since you seem to be referring to a right triangle, the Pythagorean theorem works:

A^2 + B^2 = C^2

A^2 + 38^2 = 66^2

A^2 = 4356 - 1444

A^2 = 2912

A = 53.96 (rounded)

HTH

Charles