The centre of enlargement is the point from which a shape is enlarged.

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

Enlarging objects

Maths

In this unit, pupils explore the effects of different transformations and whether the transformed shape is congruent or similar to the original shape. This is built on in the future unit where pupils formalise the criteria for determining congruence in triangles and study rotational symmetry

In this unit, pupils translated and reflected simple shapes on the full coordinate grid. In this unit, these processes are formalised and rotation and enlargement are introduced

Transformations

Which of these is NOT a method for enlarging an object?

When enlarging, an image and object can overlap.

The shape is being enlarged by a scale factor of $$1\over2$$. The centre of enlargement is marked with a cross. What are the new coordinates of B?

go through all of the vertices of the image

go through all of the vertices of the object

go through all of the vertices of both object and image

When using lines to check the position of the image, the lines must

When enlarging by a non-integer scale factor, the image is always smaller than the object.

Jun is enlarging an object by a scale factor of $$2{1\over2}$$. If one of the object's lengths is 5, what will the corresponding length be in the image?

Scale factor is the {{}} between similar shapes that describes how large one shape is compared to the other.

The invariant point from which an object is enlarged is known as the  _________________.

P has been enlarged to create A. What is the scale factor?

P has been enlarged to create A. What is the value of $$a$$?

P has been enlarged to create B. What is the scale factor?

P has been enlarged to create B. What is the value of $b$$?

This lesson will soon be taken down.

Enlarging objects

Lesson outcome