volume bangun tersebut adalah... a. 18836 b. 18681 c. 15675 d. 15543

V 1/2 bola = 2/3 π r^3 = 2/3 x 3,14 x 15 x 15 x 15 = 7065 cm^3

t kerucut = 39^2 - 15^2 = 1521 - 225 = 1296 = 36 (akar dari 1296)

V kerucut = 1/3 π r^2 t = 1/3 x 3,14 x 15 x 15 x 36 = 8478 cm^3

V bangun ruang = 7065 + 8478 = 15543 cm^3 (d)