Question

QIB Solve.
(1) The radius of a sphere is R. Find the ratio of its surface area to
the area of a circle of the same radius.​

Answer 1

Answer:

4:1

Step-by-step explanation:

Let radius of sphere = r

∴ Surface sphere =4πr^2

and total surface area of circle =πr^2

Now, surface of sphere =4πr^2 = 4 /1=4:1= 4

area of circle. π^2

Answer 2

Given :-

• The radius of sphere is R

To find :-

The ratio of its surface area to the area of the same radius.

Solution :-

According to the question,

Ratio

= Surface area of sphere / Area of circle

Subsitute the required values,

= 4πr²/ πr²

= 4/1

Ratio

= Surface area of sphere / Area of circle

= 4/1

Hence, The ratio of given figures

is 4 :1$.$

Learn More

• CSA of cuboid = 2 ( l + b)h

• TSA of cuboid = 2( lb + bh + hl)

• CSA of cube = 4a²

• TSA of cube = 6a²

• CSA of cylinder = 2πrh

• TSA of cylinder = 2πr(r + h)

• CSA of cone = πrl

• TSA of cone = πr( l + r)