If the surface area of the cone is 15 π, then the center angle of the side view is 60 ° and the volume of the cone is? Let the generatrix be l and the bottom radius be r The lateral area is 60 × Pai × L Λ 2 / 360 = Pai × R × L L = 60R Why not?

If the surface area of the cone is 15 π, then the center angle of the side view is 60 ° and the volume of the cone is? Let the generatrix be l and the bottom radius be r The lateral area is 60 × Pai × L Λ 2 / 360 = Pai × R × L L = 60R Why not?

Let R be the radius, then the generatrix is 6R: π R & # 178; + π × R × 6R = 15 π 7 π R & # 178; = 15 π r = √ 15 / 7 conic volume = bottom area × height = 1 / 3 × π R & # 178; × √ [(6R