Question

mehul does not like the colour on the wooden ball he has .so he wants to scratch and remove the color so that he can put the new one . how much area he has to scratch , if diameter of ball r cm ?

Answer 1

Answer:

g

Step-by-step explanation:

given;

radius of the sphere = r units

so the Amount of paint needed to be removed is = the total surface area of the ball.

Since the ball is a sphere so the total Surface area =4*$\pi$*r;

So the area to be Scratched = 4*$\pi$*r;

Answer 2

Given:

Diameter of the ball= r cm

To find:

The surface area of the ball

Solution:

We can find the solution by following the given steps-

We know that the ball is a sphere.

The surface area of a sphere=

$4\pi ({radius})^{2}$

We are given the diameter of the ball which is r cm.

So, the radius= diameter/2

The radius of the ball= r/2 cm

Area of the ball=

$4\pi ({r \div 2})^{2}$

$= (4\pi {r}^{2}) \div 4$

$= \pi {r}^{2}$

Therefore, the area Mehul has to scratch is $\pi {r}^{2}$.