Question

6. A balloon has a circumference of 16 cm. Use the circumference to approximate the surface area of the balloon to the nearest square centimeter. (1 point) 804 cm2 326 cm2 256 cm2 81 cm2

Answer 1

The circumference is \[C=2pir\]

The radius is \[r=C/(2\pi)=16/(2\pi)=2.55cm\]

The surface area is\[A = 4pir ^{2}=4\pi*2.55^{2}=81cm ^{2}\]

Answer 2

nice job narad - congrat