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luas permukaan setengah bola kosong = 2πr²
2 x 3,14 x 2 x 2
3,14 x 8
25,12 m²
5)
v tumpeng 1 = πr²t
3,14 x 15 x 15 x 20
14.130 cm³
v tumpeng 2 = πr²
22/7 x 17,5 x 17,5 x 25
24.062,5 cm³
selisih = 24062,5 - 14130 = 9932,5 cm³