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Verified answer
D = 42 cmr = 21 cm
Luas permukaan bola
= 4 x π x r²
= 4 x 22/7 x 21 cm x 21 cm
= 5.544 cm²
Volume bola
= 4/3 x π x r³
= 4/3 x 22/7 x 21 cm x 21 cm x 21 cm
= 38.808 cm³