Calculate the area of a full surface of everyone rectangular a parallelepiped. The 2nd task

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1) (2*3) *2+(10*2)*2+(3*10)*2=6*2+20*2+30*2=12+40+60=112 см^2 2) 5*8*2+5*3*2+3*8*2=40*2+15*2+24*2=80+30+48=158 см^2 3) 7*4*2+4*2*2+7*2*2=28*2+8*2+14*2=56+16+28=100 см^2
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Answer add