.jpg "Perimeter And Areas")
- Perimeter is the distance around a closed figure whereas area is the part of plane occupied by the closed figure.
- Area is the measure of the part of plane or region enclosed by it.
- We have learnt how to find perimeter and area of a square and rectangle in the earlier class. They are:
(a) Perimeter of a square = 4 × side
(b) Perimeter of a rectangle = 2 × (length + breadth)
(c) Area of a square = side × side
(d) Area of a rectangle = length × breadth - Area of a parallelogram = base × height
- Area of a triangle =
(area of the parallelogram generated from it) 
- Area of equilateral triangle =
- The distance around a circular region is known as its circumference.
- The ratio of circumference and diameter of a circle is a constant is denoted by
(pi). - Circumference of a circle = πd, where d is the diameter of a circle and
(approximately). - Area of a circle
, where r is the radius of the circle. - Based on the conversion of units for lengths, studied earlier, the units of areas can also be converted:
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