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K = phi.d
= 3,14.60
= 188,4 cm
L = phi.r²
= 3,14.30.30
= 2826 cm²
diameter 40:
K = phi.d
= 3,14.40
= 125,6 cm
L = phi.r²
= 3,14.20.20
= 1256 cm²
jadiin yg terbaik y..