If the relative error in measuring the radius of a circular plane is `alpha` , find the relative error in measuring its area.

Explanation

To find the relative error in measuring the area of a circular plane when the relative error in measuring the radius is given as \( \alpha \), we can follow these steps:

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