Question

A balloon has a circumference of 23 cm. Use the circumference to approximate the surface area of the balloon to the nearest square centimeter.

168 cm2
674 cm2
529 cm2
1,662 cm2

Answer 1

I think find the volume of the circumference 

Answer 2

168 cm2

Explanation:

hello

the circumference is given by the formula

`c=2*\pi *radius`

where

`r=(C)/(2*3.1516) \\r=(23)/(2*3.1516) \\r=3.66 cm\\\\`

now with the radius of the balloon we can calculate the Surface area

`s.a= 4\pi *r^(2) \\s.a= 4\pi *3.66^(2) \\s.a= 4\pi *13.39\\s.a.=4*3.1415*13.39\\`

S.A.=168 square centimeters approximately

Have a great day