Question

The area of a circle is 16 pi cm2. What is the circle's circumference?

Answer 1

`"circumference "=8pi" cm"`

Explanation:

`"area of a circle "=pir^2larr" r is the radius"`

`"area is given as "16pi`

`rArrpir^2=16pilarr" divide both sides by "pi`

`rArrr^2=16rArrr=4`

`"circumference "=2pir=2pixx4=8pi" cm"`