Perimeter is the distance around a two-dimensional shape.

A scale factor is the multiplier between similar shapes that describes how large one shape is compared to the other.

Two shapes are similar when one shape can become the other after a resize, flip, slide or turn.

Describe the relationship between scale factors and perimeters of two shapes

Maths

In this unit pupils will explain how to calculate the area of a parallelogram and a triangle describing the relationship between scale factors and side lengths. They will describe positions in all four quadrants drawing and translating simple shapes and reflecting them in the axes In the future unit pupils extend their knowledge of plotting coordinates by now plotting non-integer values.

In the prior unit pupils used knowledge of shape properties to draw, sketch and identify shapes. In this unit pupils will explain how to calculate the area of a parallelogram and a triangle. They will describe the relationship between scale factors and side lengths of two shapes. They will describe positions in all 4 quadrants drawing and translating simple shapes and reflecting them in the axes.

Area, perimeter, position and direction

Select all of the scale factors where the result would be a shape with a greater length and width than the original.

Shape A is a square with a side length of 3 cm and Shape B is a square with a side length of 12 cm. Shape A has been scaled by a scale factor of {{  }} to create Shape B.

Shape A is an equilateral triangle with a side length of 3 cm and Shape B is an equilateral triangle with a side length of 9 cm. Shape A has been scaled by a scale factor of {{  }} to create Shape B.

Shape A is a square with a side length of 3 cm which has been scaled by a scale factor of 3 to get Shape B. What is the perimeter of Shape B? {{  }} cm.

Shape A is a triangle with a side length of 3 cm which has been scaled by a scale factor of 4 to get Shape B. What is the perimeter of Shape B? {{  }} cm.

Select all of the scale factors where the result would be a shape with a smaller length and width than the original.

Which of these is the same as dividing by two?

Match the words to their correct definitions.

Match the equations to the correct product.

Which of the following are multiples of 7?

This lesson will soon be taken down.

Describe the relationship between scale factors and perimeters of two shapes

Lesson outcome