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JAMB UTME
The radius of a circle is increasing at the rate of 0.02 cms-1.Find the rate at which the area is increasing when the radius of the circle is 7cm.
A.
0.53 cm-2s-1
B.
0.35 cm-2s-1
C.
0.88 cm-2s-1
D.
0.75 cm-2s-1
Answer: C
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