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a=7cm
Pp= 7cm * 7cm = 49cm2
161cm 2 - 49cm 2 =112cm 2
112cm2:4=28cm2
P=1/2*a*h
28cm2=1/2*7cm*h
28cm2:1/2=56cm2
56cm2:7cm=8cm
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h=8cm
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A=7CM
H=8CM