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Mathematics, 30.09.2019 02:30 alex5560

Two spheres have radii of 5 and 9. what is the ratio of their surface areas?
a. 5: 9
b. 25: 81
c. 10: 18
d. 125: 729

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Two spheres have radii of 5 and 9. what is the ratio of their surface areas?
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