The radii of two circles are 19 cm and 9 cm respectively. Find the radius of the circle which has circumference equal to the sum of the circumferences of the two circles.

Explanation

To find the radius of the circle whose circumference is equal to the sum of the circumferences of two given circles with radii 19 cm and 9 cm, we can follow these steps:

### Step 1: Write down the formula for the circumference of a circle.
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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