Grade 9 Math: Intro to Geometry Surface Area of a Sphere

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True of False? the following is the correct formula for a surface area of a sphere: $$SA=4\pi r^{2}$$

True
False
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We have a sphere where the radius is 15cm . What is the surface area?

2827.43cm\(^2\)
1791.11cm\(^2\)
3218.23cm\(^2\)
2434.88cm\(^2\)
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We have a sphere where the radius is 8cm . What is the surface area?

712.23cm\(^2\)
804.25cm\(^2\)
402.12cm\(^2\)
679.56cm\(^2\)
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We have a sphere where the diameter is 20cm . What is the surface area?

1256.64cm\(^2\)
1121.96cm\(^2\)
1489.02cm\(^2\)
1345.19cm\(^2\)
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We have a sphere where the circumference is 20cm . What is the surface area?

412.52cm\(^2\)
512.85cm\(^2\)
647.02cm\(^2\)
333.33cm\(^2\)
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