The amount of region enclosed by a plane closed figure is called its ________.
The amount of region enclosed by a plane closed figure is called its area.
Step 1: A plane closed figure is a flat shape that starts and ends at the same point. Examples: triangle, square, circle.
Step 2: The region enclosed means all the space inside the boundary of the shape.
Step 3: The amount of this inside space is called its area.
Step 4 (units): We measure area in square units, like \(\text{cm}^2\) or \(\text{m}^2\). Each \(\text{cm}^2\) is a little square that is \(1\,\text{cm}\) long and \(1\,\text{cm}\) wide.
Step 5 (quick examples):
Note: Area is different from perimeter. Perimeter is the length around the shape, while area is the space inside it.