Eric Nicholas K's answer to Georgia Jansen's Secondary 4 A Maths Singapore question.
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We are given the circumference of the circle. We must extract the radius out of this data.
Subsequently, we define the area of the circle and then evaluate dA/dr when r = the radius which you obtained earlier.
You are also given that dA/dt.
By the chain rule,
dA/dt = dA/dr * dr/dt
Sub in values of dA/dt and dA/dr.
Subsequently, we define the area of the circle and then evaluate dA/dr when r = the radius which you obtained earlier.
You are also given that dA/dt.
By the chain rule,
dA/dt = dA/dr * dr/dt
Sub in values of dA/dt and dA/dr.
Date Posted:
5 years ago
Sorry, dr/dt = 1/12 cm/s. Correction.