Question

if the radius of a circle is d doubled ,what happens to its: A, circumference? B, area?​

Answer 1

Answer:

let radius be r cm

circumference =2pie r

when.it double the radius =2r

circumference =2pie×2r=4pie r

then c= double

B. area=pie r2

and =pie 2r2 = 4pie r2

= fourth pie r2