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OpenStudy (anonymous):
If a tennis ball has a diameter of approximately 6.9 centimeters, what is its surface area? 149.57 square centimeters 1,032.04 square centimeters 299.14 square centimeters 598.28 square centimeters
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OpenStudy (cwrw238):
surface are of sphere = 4 * pi* r^2
OpenStudy (cwrw238):
r = radius = half diameter here the radius = 1/2 * 6.9 cms
OpenStudy (anonymous):
i got 597.98
OpenStudy (cwrw238):
its 4 * 3.142 * 3.45^2
OpenStudy (cwrw238):
= 149.57 sq cms
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OpenStudy (cwrw238):
look like you might have multiplied by 4 twice maybe
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