Question

the radius of a sphere increases by 25% . find the percentage increases in its surface area​

Answer 1

Answer:

212.5

Step-by-step explanation:

Let the previous radius be r. Then the surface area is 4r^2.

The new radius is increased by 25%.

Therefore, R= r+25/100*r

R= r+r/4

R= 5r/4

The surface area will be 4*5r/4*5r/4

25r^2/4.

The percentage increment will be-

25/4 / 4/2 * 100-100

50/16 *100-100

5000/16-100

312.5-100

212.5% increase.

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Answer 2

Step-by-step explanation:

the radius of the sphere is 25%. what will be the coarse and finance.........I

area of circle formula:- 2*22/7*radius

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