To find the perimeter of a rectangle, we will use the following formula:

where a, b, c, and d are the lengths of the sides of the rectangle.

Now, we know the width of the rectangle is 8cm.  Because it is a rectangle, we know the opposite side is also 8cm.  We also know the length is three times the width.  Therefore, the length is 24cm.  Because it is a rectangle, we know the opposite side is also 24cm.  

Knowing all of this, we can substitute into the formula.  We get

To find the perimeter of a rectangle, we will use the following formula:

where a, b, c, and d are the lengths of the sides of the rectangle.

Now, let's look at the rectangle.

We can see the length is 9 inches.  Because it is a rectangle, the opposite side is also 9 inches.  We can see the width is 6 inches.  Because it is a rectangle, the opposite side is also 6 inches. 

Knowing this, we can substitute into the formula.  We get

To find the perimeter of a rectangle, we will use the following formula:

where a, b, c, and d are the lengths of the sides of the rectangle.

Now, we know the length of the rectangle is 8cm.  Because it is a rectangle, we know the opposite side is also 8cm.  We know the width of the rectangle is half the length.  Therefore, the width is 4cm.  Because it is a rectangle, the opposite side is also 4cm.

Knowing this, we can substitute into the formula.  We get

To find the perimeter of a rectangle, we will use the following formula:

where a, b, c, and d are the lengths of the sides of the rectangle.

Now, we know the length of the rectangle is 7in.  Because it is a rectangle, the opposite side is also 7in.

We also know the width of the rectangle is 4in.  Because it is a rectangle, the opposite side is also 4in.

Knowing this, we can substitute into the formula.  We get

To find the perimeter of a rectangle, we will use the following formula:

where a, b, c, and d are the lengths of the sides of the rectangle.

Now, we know the width of the rectangle is 4in.  Because it is a rectangle, we know the opposite side is also 4in.

We also know the length is three times the width.  Therefore, the length is 12in.  Because it is a rectangle, the opposite side is also 12in.

Knowing this, we can substitute into the formula.  We get

To find the perimeter of a rectangle, we will use the following formula:

Where a, b, c, and d are the lengths of the sides of the rectangle.

Now, we know the length of the rectangle is 12cm.  Because it is a rectangle, the opposite side is also 12cm.  We also know the width of the rectangle is a quarter of the length.  To find the width, we will divide 12 by 4.  Therefore, the width is 3cm.  Because it is a rectangle, the opposite side is also 3cm.

Knowing this, we can substitute into the formula.  We get

To find the perimeter of a rectangle, we will use the following formula:

Where a, b, c, and d are the lengths of the sides of the rectangle.

Now, we know the width of the rectangle is 7in.  Because it is a rectangle, the opposite side is also 7in.  We also know the length of the rectangle is three times the width.  Therefore, the length is 21in.  Because it is a rectangle, the opposite side is also 21in.

Knowing this, we can substitute into the formula.  We get

To find the perimeter of a rectangle, we will use the following formula:

Where a, b, c, and d are the lengths of the sides of the rectangle.

Now, we know the width of the rectangle is 7in.  Because it is a rectangle, the opposite side is also 7in.

We know the length is two times the width.  Therefore, the length is 14in.  Because it is a rectangle, the opposite side is also 14in.

Knowing this, we can substitute into the formula.  We get

To find the perimeter of a rectangle, we will use the following formula:

Where a, b, c, and d are the lengths of the sides of the rectangle.

Now, we know the length of the rectangle is 36cm.  Because it is a rectangle, the opposite side is also 36cm.  We also know the width is a third of the length.  Therefore, the width is 12cm.  Because it is a rectangle, the opposite side is also 12cm.

Knowing this, we can substitute into the formula.  We get

To find the perimeter of a rectangle, we will use the following formula:

Where a, b, c, and d are the lengths of the sides of the rectangle.

Now, we know the width of the rectangle is 6in.  Because it is a rectangle, the opposite side is also 6in.

We know the length is four times the width.  Therefore, the length is 24in.  Because it is a rectangle, the opposite side is also 24in.

Knowing this, we can substitute into the formula.  We get