9. What is the surface area of a tennis ball with a diameter of 2.6 Inches? Use 3.14 for pl and round to the nearest hundredth. O 5.31 sq in
10.61 sq in
O 8.16 sq in
O 21.23 sq in

D: 21.23 sq in

Step-by-step explanation:

A tennis ball is a sphere, so we're going to use the surface area of a sphere formula. (4πr²)

Remember that radius is HALF of the diameter, which in this case is 2.6. This means the radius is 1.3.

π represents 3.14

Once you plug the values into the above equation, you should receive the above answer.

-2 is the right