Mathematics problems in grade six of primary school As shown in the right figure, for a triangular cardboard, the ratio of two right angle sides AB and BC is 1:2, and ab is 6 cm long. If you rotate AB side as an axis for one circle, then the volume of the formed cone is () cubic cm
From ab: BC = 1:2, ab = 6cm, BC = 12cm
The height of the cone you need is ab = 6cm, and the bottom radius is BC = 12cm
So v = 1 / 3 * 12 * 12 * Π * 6 = 288 Π (cm2)