Find the third part by the rectangle with sides 3 and 6 cm.

Answer: the third part of the rectangle is 6 cm².

If we need to find any part of a rectangle, then we can only talk about finding a part of its area. The area of a rectangle is defined as the product of its length and width.

Find the area of the rectangle:

3 * 6 = 18 cm².

Divide the resulting area value by 3 and get the answer to the problem question:

18/3 = 6 cm².

Note. It would be wrong to first divide the lengths of the sides of the rectangle by 3 and then calculate the area you are looking for. In this case, it would be equal to 2 cm².