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3*5*2+3*10*2+5*10*2=30+60+100=190cm2
b
1,2*2,5*2+1,2*7,2*2+2,5*7,2*2=6+17,28+36=59,28m2
c
2*2*6=24cm2
d
3,4*3,4*6=69,36mm2