4th Class Mathematics Perimeter and Area Perimeter and Area

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

1. The perimeter of a rectangle is twice the sum of its length and breadth.

Perimeter = 2x (Z + b) units

1. 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.