SPHERE

Grade IX

SPHERE

Fill in the Blank

Calculate the surface area of a sphere which has 21 cm of radius!

Fill in the Blank

What is the surface area of a solid hemisphere if its diameter is 8 cm?

.

Fill in the Blank

Look at the following figure!

Calculate the surface area of a quarter of solid sphere with diameter 20 cm!

Fill in the Blank

An outside a hemispherical roof with 7 meter in diameter will be painting. If a tin of paint can cover 11 m² then how many the number of tins are needed?

Multiple Choice

There are two spheres with diameter 3.5 cm and 7 cm. What is the ratio of area of those spheres?

• 1 : 2

• 1 : 3

• 1 : 4

• 1 : 6