volume bangun adalah? tolong pake cara

Jari - jari = 27 - 18 = 9

V 1/2 bola = 2/3 π r^3 = 2/3 x π x 9 x 9 x 9 = 486 π cm^3

V tabung = π r^2 t = π x 9 x 9 x 18 = 1458 π cm^3

V bangun ruang = 486 + 1458 = 1944 π cm^3 (c)