Question

Q.No. 15 The rate of change of the area
of the circle with respect to its radius rat
r=5 cm is:​

Answer 1

Answer:

220/7 or 10π

Step-by-step explanation:

given that r= 5cm

area of the circle= πr^2

dA/ dr = d/dr(πr^2)

=π(2r)+r^2(0)

π(2r) +0

π(2×5)= 10π

10×22/7=220/7