Perimeter of irregular shapes

Front

What is perimeter?

Back

Perimeter is the total distance around the outside of a shape.

Front

How do you find the perimeter of an irregular shape?

Back

To find the perimeter of an irregular shape, add the lengths of all its sides together.

Front

If a shape has sides measuring 5 cm, 7 cm, and 3 cm, what is the perimeter?

Back

The perimeter is 5 cm + 7 cm + 3 cm = 15 cm.

Front

What is a missing side in a shape?

Back

A missing side is a side length that is not given but can be calculated using the perimeter.

Front

If the perimeter of a rectangle is 20 cm and one side is 6 cm, what is the other side?

Back

The other side is 20 cm - 6 cm - 6 cm = 8 cm.

Front

What is the formula for the perimeter of a rectangle?

Back

The formula is P = 2(length + width).

Front

If a triangle has sides of 3 cm, 4 cm, and 5 cm, what is the perimeter?

Back

The perimeter is 3 cm + 4 cm + 5 cm = 12 cm.

Front

What do you do if you have a shape with one missing side?

Back

You can find the missing side by subtracting the known sides' lengths from the total perimeter.

Front

If a shape has a perimeter of 30 cm and three sides are 10 cm, 8 cm, and 5 cm, what is the missing side?

Back

The missing side is 30 cm - (10 cm + 8 cm + 5 cm) = 7 cm.

Front

What is an irregular shape?

Back

An irregular shape is a shape that does not have equal sides or angles.