How do you draw a shape with a 9cm perimeter?

Think about two numbers whose multiplication is 9 or simply think about the factors of 9.

Factors of 9 are 3x3

Now see perimeter of rectangle is 2 times sum of length and breadth.

Perimeter of rectangle is 4 times side.

2 and 4 are of the factors of 9. So the figure cannot be rectangle or square.

Perimeter of triangle= Sum of all sides

9 = 1+3+5

=9

Hence it is possible to have a triangle with perimeter 9cm as there are various numbers whose addition could be 9.

So the figure could be triangle.