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Verified answer
Luas setengah bolaD = 21 cm
r = D/2 = 21/2 = 10,5 cm
L = 2.π.r²
L = 2 x 22/7 x 10,5 x 10,5
L = 2 x 22 x 1,5 x 10,5
L = 693 cm²
Luas tabung tanpa tutup
t = 51 - 10,5 = 40,5 cm
L = π.r².t
L = 22/7 x 10,5 x 10,5 x 40,5
L = 22 x 1,5 x 10,5 x 40,5
L = 14.033,25 cm²
Luas gabungan
L = 693 cm² + 14.033,25 cm² = 14.726,25 cm²