Question

If radius of a circle is increased by x%, then by what % area increases ? Find solution

Answer 1

Answer:

If radius of a circle is increased by x%, then by % area increases is 2x%.

Answer 2

Answer:

Step-by-step explanation:

Area of a circle =A= πr²

Hence, dA=2πrdr

Also, dA/A=2 dr/r

As, r is increased by x %, we have dr=x/100r

Hence,  dA/A=2 x/100  

Thus, area is increased by 2x%