Question

diketahui volume suatu kerucut 770 cm pangkat 3 jika tinggi kerucut 15 cm dan P = 22 per 7 Hitunglah panjang jari-jari alas kerucut tersebut

Answer 1

V = 1/3 x phi x r^2 x t
770 = 1/3 x 22/7 x r^2 x 15
770 x 7 = 1/3 x 22 x 15 x r^2
5.390 = 22 x 5 x r^2
5.390 = 110r^2
r^2 = 5.390 / 110
r^2 = 49
r = 7 cm