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4)L1=20×20=400cm2
L2=3,14×10×10×1/2
=157cm2

L total=400-157=243cm2(b)


5)L1=12×12×1/2
=72cm2
L2=3,14×3×3
=28,26cm2

L arsir=72-28,26
=43,74cm2(a)