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a=10cm
h=8cm
P=128cm2
P=1/2*(a+b)*h
128= 1/2 * h * (a+b)
128= 1/2*8*(a+b)
128=4*a + 4*b
128=4*10 + 4*b
128=40+4b
88=4b/:4
b=22cm
L=a+b+c+d
L=10+10+10+22
L=52cm