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Hi Michael, In every right triangle, the square of the hypotenuse is always equal to the sum of the squares of the other two sides. This is known as the Pythagorean Theorem and you may have seen it written as: In your question, c = 25, and a = 10. You must solve for b: 25^2 = 10^2 + b^2 At this point we must take the square root of both sides of the equation, keeping only the positive square root and rejecting the negative square root (as length can not be negative). Therefore b = sqrt(525) = 22.913 (rounded to the nearest thousandth). Hope this helps,
 


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