Mensuration:
Mensuration is the branch of mathematics which concerns itself with the measurement of Lengths, areas & volume of different geometrical shapes or figures.
Plane Figure:Β A figure which lies in a plane is called a plane figure.
For e.g: Β a rectangle, square, a rhombus, a parallelogram, a trapezium.
Β
Perimeter:
The perimeter of a closed plane figure is the total length of its boundary.
In case of a triangle or a polygon the perimeter is Β the sum of the length of its sides.
Unit of perimeter is a centimetre Β (cm), metre(m) kilometre(km) e.t.c
Area:Β The area of the plane figure is the measure of the surface enclose by its boundary.
Β
The area of a triangle are a polygon is the measure of the surface enclosed by its sides.
A square centimetre (cmΒ²) is generally taken at the standard unit of an area. We use square metre (mΒ²) also for the units of area.
Circumference of a circle is the perimeter of a circle.
In a circle the radius is half of the diameter.
The approximate value of Ο( Pi) is= 22/7Β
==========================================================
