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luas yg di arsir
luas = ( s x s) - ( 1/2 x π x r²) - (1/2 x a x t)
= (20 x 20) - ( 1/2 x 3,14 x 10 x 10) - ( 1/2 x 20 x 8)
= 400 - 157 - 80
= 163 cm²