Units of Length

definition

Measure length using a scale in different units

This involves measuring the length of any object in different units like  
For example,
Place the pencil along the length of the scale. Keep one end of the pencil on zero of the scale. The other end of the pencil will touch some point on the scale.
That point measures the length of the pencil.
A regular scale measures lengths in either centimetres or inches.

diagram

Measure length using a scale in different units (m, cm, mm)

length of pencil is 9 cm
length of easer is 3cm... so on

formula

Perimeter of Rectangle

Perimeter of Rectangle
where , length of rectangle
            width of rectangle

formula

Perimeter of Square

Perimeter of square
where side of the square

formula

Perimeter of Rhombus

Perimeter of Rhombus
is the side of rhombus.