<PRE><B>Question 815714</B>
use pythagorean thm:
h = sqrt( aa + bb )
28 = sqrt( 23^2 + b^2 )
28^2 = 23^2 + b^2
784 = 529 + b^2
b^2 = 784 - 529
b^2 = 255
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b = 15.97 cm
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