pakai rumus dan caranya yg jelas

^ = pangkat

Volum kerucut = 1/3(phi.r^2)t
196phi = 1/3(phi.r^2)12
196phi.3 = (phi.r^2)12
588phi = (phi.r^2)12
588phi/12 = phi.r^2
49phi = phi.r^2
49phi/phi = r^2
r = √49 = 7cm