Using the figure and the Pythagorean theorem, we can write two equations which both equal begin mathsize 12px style h squared colon space h squared equals b squared minus left parenthesis a minus x right parenthesis squared space a n d space h squared equals d squared minus x squared end style. Set them equal to each other and solve for \large d^2 .

Using the figure and the Pythagorean theorem we can write two equations which both equal begin mathsize 12px style h squared colon space h squared equals b squa class=


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