A rectangular piece is 20m and 15m wide. From its four corners, quadrants of radii 3.5m have been cut. Find the area of the remaining part.

Explanation

To find the area of the remaining part of the rectangular piece after cutting out the quadrants from its corners, we can follow these steps:

### Step 1: Calculate the area of the rectangle
The area of a rectangle is given by the formula:
\[ \text{Area of rectangle} = \text{Length} \times \text{Width} \]
Given the length is 20 m and the width is 15 m, we can calculate:
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