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Mathematics
Mathematics
Problem
Choose the correct answer for questions 17 and 18. 17. The rate of change of the area of a circle with respect to its radius
r
r
r
at
r
=
6
c
m
r=6 \mathrm{~cm}
r
=
6
cm
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
(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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