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

Answer:

168  cm2

Step-by-step explanation:

hello

the circumference is given by the formula

$c=2*\pi *radius$

where

$r=\frac{C}{2*3.1516} \\r=\frac{23}{2*3.1516} \\r=3.66 cm$

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