Posted by kay on Monday, May 16, 2011 at 7:13pm.
r^2 = 9^2 + (40)^2 = 1681cm^2,
r = 41cm.
P = 9 + 40 + 41 = 90cm.
A = BH/2 = 9*40 / 2 = 180cm^2.
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