Geography textbook has a width of 9 inches and a diagonal of 15 inches. What is the length of the textbook?

12 inches

Step-by-step explanation:

The Pythagorean's theorem states that a triangle's hypotenuse's length is equal to a^2+b^2=c^2.

9 is a, b is the length, and c is the 15.

9^2+b^2=225

225-81=144

The square root of 144 is 12, therefore 12 inches is the length.

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step-by-step explanation:

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