The surface of a sphere is 616cm square. Find its radius
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Step-by-step explanation:
Surface of a sphere is 4pi r^2
616=4×22/7×r^2
616×7/4×22 = r^2
154×7/22 =r^2
7×7=r^2
Therefore, r^2 = 49
r=root49
Hence, r=+or- 7
Since radius cannot be negative r is +7 cm.
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