Perimeter: Missing side

Front

What is perimeter?

Back

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

Front

How do you calculate the perimeter of a rectangle?

Back

Add the lengths of all four sides or use the formula: P = 2(length + width).

Front

If one side of a rectangle is 5 cm and the other is 3 cm, what is the perimeter?

Back

P = 2(5 + 3) = 16 cm.

Front

What is the formula for finding the length of a missing side in a rectangle when the perimeter is known?

Back

If P is the perimeter and one side is known, use the formula: Length = (P/2) - other side.

Front

If the perimeter of a square is 20 cm, what is the length of one side?

Back

Length of one side = Perimeter / 4 = 20 cm / 4 = 5 cm.

Front

What is the perimeter of a triangle with sides measuring 3 cm, 4 cm, and 5 cm?

Back

P = 3 + 4 + 5 = 12 cm.

Front

If the perimeter of a rectangle is 30 cm and one side is 10 cm, what is the length of the other side?

Back

Length of the other side = (30/2) - 10 = 5 cm.

Front

What do you call a shape with four equal sides?

Back

A square.

Front

How do you find the perimeter of a polygon?

Back

Add the lengths of all the sides together.

Front

If a rectangle has a length of 8 cm and a width of 2 cm, what is its perimeter?

Back

P = 2(8 + 2) = 20 cm.