Perimeter and Area
Synopsis
Closed Curve:
- A curve which begins and ends at the same point is called a closed curve.
Perimeter:
- The length of the boundary or edge of a figure is called its perimeter.
- Perimeter of a triangle is the sum of the lengths of its three sides.
Perimeter of triangle
- The perimeter of a square is four times the length of its side.
Perimeter \[=(\text{4}\times \text{S})\] units
- The perimeter of a rectangle is twice the sum of its length and breadth.
Perimeter = 2x (Z + b) units
- Perimeter is expressed in units of length.
Area:
- The amount of surface covered by a plane figure is its area.
- Area of an enclosed plane is the number of square units that fit into it.
- Area is always expressed in square units.