Perimeter

A rectangle’s perimeter includes two lengths and two widths.

1. Divide the perimeter by 2 to get the sum of one length and one width.
2. Subtract the known side length from that sum.

For example, a perimeter of 20 cm and one side of 4 cm give the other side as 20 ÷ 2 − 4 = 6 cm. Check by adding all four sides.

All four sides of a square are equal. The perimeter is their total length.

To find one side length, divide the perimeter by 4. For example, a perimeter of 20 gives a side of 20 ÷ 4 = 5. Check by multiplying by 4.

A rectangle’s perimeter includes two lengths and two widths.

1. Divide the perimeter by 2 to get the sum of one length and one width.
2. Subtract the known side length from that sum.

For example, a perimeter of 20 cm and one side of 4 cm give the other side as 20 ÷ 2 − 4 = 6 cm. Check by adding all four sides.

A square has four sides of equal length. Its perimeter is the sum of all four sides.

Multiply one side length by 4. For example, a side of 3 cm gives a perimeter of 3 + 3 + 3 + 3 = 12 cm.

The perimeter is the sum of all the side lengths. Opposite sides of a rectangle have equal lengths.

Add the length and width, then multiply the sum by 2. For example, sides of 5 and 3 give a perimeter of 5 + 3 + 5 + 3 = 16.

Use the side lengths stated in the question or labelled in the drawing.

A square has four sides of equal length. Its perimeter is the sum of all four sides.

Multiply one side length by 4. For example, a side of 3 cm gives a perimeter of 3 + 3 + 3 + 3 = 12 cm.

The fence goes around the whole rectangular garden, so find its perimeter. There are two equal lengths and two equal widths.

Add the length and width, then multiply by 2. The answer is in metres. Include all four sides, rather than calculating the area.

The perimeter is the sum of all the side lengths. Opposite sides of a rectangle have equal lengths.

Add the length and width, then multiply the sum by 2. For example, sides of 5 and 3 give a perimeter of 5 + 3 + 5 + 3 = 16.

Use the side lengths stated in the question or labelled in the drawing.

A rectangle’s perimeter includes two lengths and two widths.

1. Divide the perimeter by 2 to get the sum of one length and one width.
2. Subtract the known side length from that sum.

For example, a perimeter of 20 cm and one side of 4 cm give the other side as 20 ÷ 2 − 4 = 6 cm. Check by adding all four sides.

A square has four sides of equal length. Its perimeter is the sum of all four sides.

Multiply one side length by 4. For example, a side of 3 cm gives a perimeter of 3 + 3 + 3 + 3 = 12 cm.