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a=36+25
a=√61
P=a×h/2
P=5×6/2= 30/2= 15
15=√61×h/2 I×2
30=√61×h
h√61= 30 I÷√61
h=30/√61 × √61/√61= 30√61/61
h=r
r=30√61/61
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