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.
Select one:
a. 1,662 cm2
b. 529 cm2
c. 168 cm2
d. 674 cm2

Answer 1

would this be C? @gorv

Answer 2

Surface area is 4 pi r sq
Circumference is 2 pi r
Circumference is 23 cm
2pi r =23
r = 23 x 7/44 = 3.659 cm
Surface area = 4 pi r sq = 4 x 22/7 x 3.659 x 3.659 = 168.31
Answer : 168 sq cm.