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Verified answer
D = 20 cmr = 1/2 x D = 1/2 x 20 = 10 cm
Luas belahan bola padat = 3. π. r³
L = 3 x 3,14 x 10²
L = 3 x 3,14 x 100
L = 3 x 314
L = 942 cm²