Total Surface Area of a Right Circular Cone

Q. The volume of a conical shaped tank of height 9 ft and diameter 8 ft as shown is cu ft.
$\text{[Take π=}\frac{22}{7}]$

1. 272.5
2. 603.4
3. 175.8
4. 150.9

Q.

A toy has a hemispherical base with a conical top attached to it. Radius of the hemisphere = 6 cm. Height of the cone = 8 cm. What is the surface area of the toy?

1. 132π cm²

2. 60π cm²

3. 82π cm²

4. 100π cm²

Q. A sphere, a cylinder and a cone are of the same radius and same height. Find the ratio of their curved surface.

1. $4:2:\sqrt{2}$
2. $2:4:\sqrt{3}$
3. $4:3:\sqrt{2}$
4. $2:4:\sqrt{2}$