round to nearest tenth

Question

A girls' basketball has a diameter of 17.5 cm. How much leather is required to make the ball? Round to the nearest tenth.

Answer 1

To figure out how much material to make a basketball, you would need to know the surface area of a sphere. The formula is:

SA = 4πr²

The r is radius in the formula. Given the diameter is 17.5 cm, divide by 2 to get the radius. 17.5/2 = 8.75 cm

Plugging in the values

SA = 4(3.14)(8.75)² = 961.6 cm²

Answer 2

To find how much leather is required to make the basketball, we need to determine the surface area of the basketball, which is in the shape of a sphere. The formula for calculating the surface area of sphere is:

SA = 4 • π • r²

They mentioned in the problem that the diameter is 17.5cm. That is the distance from one end of the circle to the other end, passing through the center. For this formula, you need the radius, which is half of the diameter. To find the radius, we need to divide the diameter by 2.

d = 17.5cm

r = 17.5cm/2 = 8.75cm

Then, you need to input the values you know into the formula:

SA = 4 • π • r²

SA = 4 * π • (8.75)²

SA = 962.1 cm²

Answer 3

Surface Area = SA = 4pir^2 = 4pi(17.5/2)^2

= 4pi(306.25/4) = 306.25pi

= about 306.25(3.1416)

= about 962.1 cm^2