Finding the perimeter of polygons

Maths

In this unit pupils learn how to derive and use the formula for the area of a triangle and trapezium. In the future unit, this knowledge is called upon to find the volume of different prisms and area of composite shapes

In this unit, pupils explored the relationship between perimeter and area. In particular, they considered whether a shape can have the same area and perimeter value

Perimeter and area

Perimeter is the distance around a 2D shape. It can be calculated by {{}} all of the edges together.

True or false? Number bonds can be used to calculate the perimeter more efficiently.

Which of these formulas could **not** be used to calculate the perimeter ($$P$$) of this square?

Complete the formula for the perimeter of this trapezium. $$P = $$ {{}}

You can write a {{}} to calculate the perimeter in an efficient way.

What is the mathematical name for the polygon whose perimeter ($$P$$) can be calculated using the formula $$P = t + r + 2w + y$$?

Perimeter is the distance {{}} a 2D shape

Replacing a letter in an expression with a value is known as ______

If $$a$$ = 10 and $$b$$ = 7, what is the value of the expression 2$$b$$ + 2$$a$$?

Substitute the value $$y$$ = 2 into the expression  3$$y$$ $$+$$ 5 and evaluate the result

Izzy wants to add these values: 0.24, 0.5 and 17.3 together using column addition. Select the correct layout.

This lesson will soon be taken down.

Finding the perimeter of polygons

Lesson outcome