← Calculus

How to solve

Differentiate the geometric relation with respect to time.

Steps

  1. A = πr² ⇒ dA/dt = 2πr dr/dt.
  2. Plug in r and dr/dt.
  3. Enter the coefficient of π.

Example

r=3, dr/dt=2

  1. dA/dt = 12π.
  2. Enter 12.

Answer: 12

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