Question

IMPORTANT QUESTION FOR CBSE MATHS 2020- STANDARD ( please answer )

if the circumference of a circle increases from 4 pi to 8 pi, find the percentage increase in the area of a circle​

Answer 1

Answer:

75%

Step-by-step explanation:

Area= πr²

Circumference=2πr

According to Question,

2πr= 4π( initially)

so, r= 2. therefore area = 4π

again,

2πr= 8π

so, r= 4. therefore area = 16π

now, increase in area = 16π- 4π = 12π

Therefore, % change= (12π / 16π)*100

= 75%

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