Question

if diameter of circle is increased by 40% ,then its area increases by ? solve it free

Answer 1

The formula for the area of a circle is S₀=(Pi*d^2)/4,where d is the diameter of circle and Pi=3.14, S₀ - area of circle before
increasing.
After increasing the diameter will be 1.4d and the area will be :
S₁=(Pi*(1.4d)^2)/4=(1.96Pi*d^2)/4=1.96S₀
Then the area of circle increased by 96%