Question

The radius of a sphere increases by 25%.Find the percentage increase in its surface area​

Answer 1

Step-by-step explanation:

let radius =r

new radius =r+0.25r=1.25r

surface area=4 pi r square

=4pi× (1.25) square

=4pi×1.5625

% increase=(1.5625-1)/1×100

=56.25%