Question

Volume krucut 462 cm3, tingginya 9 cm dan phi=22/7, panjang jari-jari alas kerucut adalah

Answer 1

V kerucut = 462
1/3.phi.r².t = 462
1/3.22/7.r².9 = 462
22/7.r².3 = 462
66/7.r² = 462
r² = 462 : 66/7
r² = 462 . 7/66
r² = 7.7
r² = 49
r = √49
r = 7 cm