Surface Area of Spheres Quick Check

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Question
Use the formula for the surface area of a sphere to find the surface area of a basketball that has a diameter of 9.2 inches. Use 3.14 pi and round your answer to the nearest hundredth, if necessary.(1 point)
Responses

66.44 in.2
66.44 inches squared

1,063.08 in.2
1,063.08 inches squared

84.64 in.2
84.64 inches squared

265.77 in.2
265.77 inches squared
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1 answer

To find the surface area of a sphere, you can use the formula:

\[ \text{Surface Area} = 4\pi r^2 \]

where \( r \) is the radius of the sphere.

  1. First, find the radius of the basketball. The diameter is given as 9.2 inches, so the radius is half of the diameter:

\[ r = \frac{9.2}{2} = 4.6 \text{ inches} \]

  1. Next, plug the radius into the surface area formula, using \( \pi \approx 3.14 \):

\[ \text{Surface Area} = 4 \times 3.14 \times (4.6)^2 \]

  1. Calculate \( (4.6)^2 \):

\[ (4.6)^2 = 21.16 \]

  1. Now calculate the surface area:

\[ \text{Surface Area} = 4 \times 3.14 \times 21.16 \]

  1. Multiply:

\[ \text{Surface Area} = 12.56 \times 21.16 \]

  1. Perform the multiplication:

\[ \text{Surface Area} = 266.24 \text{ in}^2 \]

Rounding to the nearest hundredth, the surface area is approximately 266.24 in².

Thus, the correct answer from the options given is 265.77 in² (closest to our calculated value).