Perimeter: Missing Sides (3.7B)

Front

What is perimeter?

Back

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

Front

How do you find the perimeter of a rectangle?

Back

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

Front

What is the perimeter of a square with each side measuring 7 cm?

Back

28 cm (Perimeter = 4 x side length).

Front

If a rectangle has a length of 10 cm and a width of 5 cm, what is its perimeter?

Back

30 cm (Perimeter = 2(10 + 5)).

Front

What is the formula for the perimeter of a triangle?

Back

Perimeter = side1 + side2 + side3.

Front

If one side of a triangle is missing and the perimeter is 20 cm, with the other two sides measuring 8 cm and 6 cm, what is the missing side?

Back

6 cm (20 - 8 - 6 = 6).

Front

What shape has 8 equal sides?

Back

An octagon.

Front

If each side of an octagon is 6 yards, what is the perimeter?

Back

48 yards (Perimeter = 8 x side length).

Front

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

Back

12 cm (Perimeter = 3 + 4 + 5).

Front

How do you calculate the perimeter of a regular polygon?

Back

Multiply the length of one side by the number of sides.