19. A spherical balloon has a circumference of 19cm. what is the approximate surface area of the balloon to the nearest square centimeter?

A) 114 cm^2

B) 460 cm^2

C) 361 cm^2

D) 1,134 cm^2

The main formula of a spherical surface area is SA = 4 x Pi x r²

the circumference is C = 19cm = 2 Pi r, so r = C / 2Pi = 19 / 6.28 = 3.02cm

so the surface area can be found by computing

SA = 4x 3.14x 3.02² = 114.5, the nearest square centimeter is A) 114 cm^2