Aballoon has a circumference of 11 cm. use the circumference to approximate the surface area of the balloon to the nearest square centimeter.

C = 2(pi)(r) so 11= 2(pi)(r) if you divide 11 by 2(pi) using pi as 3.14 you get r = 1.752 then plug in the number to S.A. = 4(pi)r^2 you will get approximately 38.55 sq. Cm of surface area.

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