The perimeter of the rectangle is 20 cm. If the length of the rectangle is 6 cm, then find its breadth.

The formula for the perimeter of a rectangle is:

Perimeter = 2 * (Length + Breadth)

Given that the perimeter of the rectangle is 20 cm and the length (L) is 6 cm, we can set up the equation:

20 = 2 * (L + B)

Now, let's solve for the breadth (B):

Divide both sides by 2:

10 = L + B

Subtract L from both sides to isolate B:

B = 10 - L

Since we know L = 6 (given in the problem), we can now calculate the breadth (B):

B = 10 - 6
B = 4

So, the breadth of the rectangle is 4 cm.