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Verified answer
Luas setengah bola pejalL = luas lingkaran + luas setengah bola
L = π r² + 1/2 x 4 π r²
L = π r² + 2 π r²
L = r² (π + 2π)
L = 20² (3,14 + 2(3,14))
L = 400 (3,14 + 6,28)
L = 400 (9,42)
L = 3.768 cm²