The width of the rectangle is 33cm, which is 3/8 of its perimeter. Find the length of this rectangle.

Because the width is 3/8 of the perimeter of the rectangle and is equal to 33 cm, then the perimeter will be:

33: 3/8 = 33 * 8/3 = 88 cm.

The perimeter of the rectangle is found by the formula:

P = 2 * (a + b).

Substituting all known data into the formula presented above, we get:

88 = 2 * (33 + b).

Now we solve the resulting equation:

33 + b = 44;

b = 44-33;

b = 11.

Answer: the length of the rectangle is 11 cm.