Practice: The figure shows a vertical section through the axis of a solid paper-
weight made in the shape of a right circular cone. Its height is 8 cm and
the diameter of its base is 4 cm. The shaded portion is made of lead 2 cm
thick while the unshaded portion is made of wood. Lead weighs 11.3
g/cm² and wood weighs 0.9 g/cm². Calculate
a. The total volume of paper-weight;
b. The volume of the wooden portion;
c. The total weight of paper-weight.
(The volume of a cone of radius r and height h is z rerh)
I

Vikram is studying the square pyramid below. on st to find the surface area of the pyramid, in square inches, vikram wrote (33.2) (34 ikram wrote (33.2)(34.2)+43(34.2)(284) what error did vikram make? o he used the same expression for the area of all four lateral faces. he used the wrong expression to represent the area of the base of the pyramid. o he used the wrong value as the height when he found the area of the lateral faces. he used an expression for surface area that only finds the total area of three faces.