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Mathematics
Mathematics
Problem
The rate of change of the area of a circle with respect to its radius
r
r
r
when
r
=
6
r = 6
r
=
6
is (A)
10
π
10\pi
10
π
(B)
12
π
12\pi
12
π
(C)
8
π
8\pi
8
π
(D)
11
π
11\pi
11
π
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