Problem

The radius of a circle is increasing at a rate of 10 centimeters per minute. Find the rate of change of the area when the radius is 5 centimeters. Round your answer to one decimal place. The rate of change of the area is Number Units

Solution

Step 1 :The problem involves a circle with a radius that is increasing at a rate of 10 centimeters per minute. We are asked to find the rate of change of the area when the radius is 5 centimeters.

Step 2 :The area of a circle is given by the formula \(A = \pi r^2\), where \(r\) is the radius of the circle.

Step 3 :We can solve this problem by taking the derivative of the area with respect to time. This gives us \(\frac{dA}{dt} = 2\pi r \frac{dr}{dt}\).

Step 4 :We are given that \(\frac{dr}{dt} = 10\) cm/min and \(r = 5\) cm.

Step 5 :Substituting these values into the equation gives us \(\frac{dA}{dt} = 2\pi (5) (10)\).

Step 6 :Solving this equation gives us \(\frac{dA}{dt} = 314.1592653589793\) cm²/min.

Step 7 :Rounding to one decimal place, the rate of change of the area when the radius is 5 centimeters is approximately \(\boxed{314.2}\) square centimeters per minute.

From Solvely APP
Source: https://solvelyapp.com/problems/8533/

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