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=(10×20:2)+(20×50)+(3,14×10×10)
=100+1000+314
=1414
b. bangun1+2(bangun2)
=(1/2×3,14×3×3)+2(1/4×3,14×3×3)
=14,13+2(7,065)
=14,13+14,13
=28,26