Answer:
Step-by-step explanation:
Perimeter of figure = Sum of all sides of the figure
Since we are supposed to draw the figure whose perimeter should be 20 units .
So, the first figure we can draw is a square.
Formula of perimeter of square = 
Now we are given the perimeter 20
So, 


Thus the side of the square should be 5 units so, that its perimeter will be of 20 units.
Refer the figure 1.
Now we can draw a rectangle with length = 7 units
Width = 3 units
Formula of perimeter of rectangle = 
= 
= 
So, the perimeter of rectangle is 20 units
Refer the figure 2 .