Using suitable variable, write the formulae for the following:
perimeter of a rhombus.
Let each side of a rhombus be aunit
perimeter =(4×side)unit=(4×a)unit=4aunit
Write the rule using variables for the following situation.
The length of the side of a regular heptagon is denoted by l. Express the perimeter p of the heptagon in terms of l.
Area of a rectangle.
Perimeter of a regular decagon