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luas=(1/8 x 3,14 x 11 x 11)-(1/8 x 3,14 x 6 x 6)=47,4925-14,13=33,3625
b.keliling=(3,14 x 40)+(20x akar 3/2):3=135,6 cm
luas=(3,14 x 20 x 20)-(2 x 10 x 10 akar3):3=1056 cm3