The radius of a circle is increasing at the rate of `0.5cm`/`sec`. Find the rate of increase of its circumference.

Explanation

To solve the problem, we need to find the rate of increase of the circumference of a circle when the radius is increasing at a specific rate. Let's break down the solution step by step.

### Step 1: Understand the relationship between radius and circumference
The circumference \( C \) of a circle is given by the formula:
\[ C = 2\pi R \]
where \( R \) is the radius of the circle.
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