Question

if a radius of a circle increased by 100%, the area of a circle will increase to.
a) 25%
b) 100%
c) 400%
d) 50%
step by step explanation please​

Answer 1

Answer:a) 25%

Step-by-step explanation:

Radius of a circle = 100%

Increased by 100%

New radius = 100+100 = 200%

Area of 1st circle = πr² = 1000π

Area of 2nd circle = 4000π

Area of 1st circle / area of 2nd circle = 1000π/4000π = 1/4

Percentage of increase = 1/4*100 = 25%

Answer 2

Step-by-step explanation:

This is because when we increase the radius of a circle by 100 % the radius of the new circle is equal to the diameter of the old circle