Question

The radius of a cirlce has increased by 20%. By what percentage does
1) the circumference increase? ii) the area increase?​

Answer 1

Answer:

1)20% 2)44%

Step-by-step explanation:

Let old radius be x

The new radius will be 120x/100

Circumference=

old circumference =2 \pi x\\

new circumference=2\pi x\\ *120/100

                  =>Increse by 20%

Area=

old area=\pi x^2\\

new area=\pi x^2\\ *120^2/100^2

               =\pi x^2\\ *144/100

       =>Increase by 44%

Answer 2

Answer:

circumference 40%

area 44%

Step-by-step explanation:

hope it will help you