Similar Shapes

Presentation

•

Mathematics

•

8th Grade

•

Medium

Fiona Davidson

Used 7+ times

FREE Resource

15 Slides • 15 Questions

Similar Shapes – Demonstration

This resource provides animated demonstrations of the mathematical method.

Check animations and delete slides not needed for your class.

What’s the same & what’s different, with these pairs of shapes?

These shapes are similar: one of the shapes is an enlargement of the other.

What’s the same & what’s different, with these pairs of shapes?

These shapes are similar: one of the shapes is an enlargement of the other.

When we enlarge shapes, do the interior angles of the shape change?

When we enlarge shapes, interior angles don’t change, only the side lengths.

How has each shape been enlarged?

4 metres

8 metres

2 metres
6 metres

35°

2 metres

4 metres

When we enlarge shapes, interior angles don’t change, only the side lengths.

How has each shape been enlarged?

4 metres

8 metres

2 metres
6 metres

35°

2 metres

4 metres

Side Lengths × 2

Scale Factor of Enlargement: 2

When we enlarge shapes, interior angles don’t change, only the side lengths.

How has each shape been enlarged?

4 metres

8 metres

2 metres
6 metres

35°

2 metres

4 metres

Side Lengths × 2

Scale Factor of Enlargement: 2

Side Lengths × 3

Scale Factor of Enlargement: 3

These are similar shapes.

What is the scale factor of enlargement?

DEMO

4 cm

Not to scale.

Similar Shapes

8 cm

These are similar shapes.

What is the scale factor of enlargement?

DEMO

4 cm

Not to scale.

Similar Shapes

8 cm

8
4= 2

Fill in the Blanks

What is the scale factor

Type answer...

Fill in the Blanks

These are similar shapes

What is the Scale factor of enlargment

Type answer...

Fill in the Blanks

These are similar shapes.

What is the scale factor of enlargement?

Type answer...

Fill in the Blanks

These shapes are similar.

What is the scale factor of enlargement

Type answer...

Are these shapes similar?

4 cm

8 cm

14 cm

Are these shapes similar?

4 cm

8 cm

14 cm

We can compare corresponding sides.

Are these shapes similar?

4 cm

8 cm

14 cm

We can compare corresponding sides.

Are these shapes similar?

4 cm

8 cm

14 cm

We can compare corresponding sides.

Are these shapes similar?

4 cm

8 cm

14 cm

We can compare corresponding sides.

The length has

a smaller scale factor of enlargement than the width.

The shapes are not similar.

Multiple Choice

Are the following similar? Why or why not?

Yes

No, the corresponding angles are not equal.

No, the ratios of the corresponding sides are not equal.

Multiple Choice

Which statement is true?

All squares are similar

All hexagons are similar

All scalene triangles are similar

All similar figures are the same shape and size

First identify the two corresponding sides.

Then find the scale factor.

Either multiply or divide by SF to find the missing length.

Finding the missing length

Multiple Choice

Find the length of x

x = 1

x = 2

x = 7

x = 1/7

Multiple Choice

Two objects that are the same shape but not the same size are _______.

Congruent

Vertical

Similar

Complementary

Multiple Choice

All corresponding sides are proportional (same ratio) in similar figures.

True

False

Multiple Choice

Find x.

6.6

4.5

5.4

7.2

Multiple Choice

Triangle ABC and XYZ are similar. Use your knowledge of scale factor to find the length of X.

100

Multiple Choice

The following shapes are similar, the smaller one is the original shape, what is the scale factor?

8:12

3:2

4:8

6:12

Multiple Choice

Poll

How did you find todays lesson?

Similar Shapes – Demonstration

This resource provides animated demonstrations of the mathematical method.

Check animations and delete slides not needed for your class.

Show answer

Auto Play

Slide 1 / 30

SLIDE

Similar Resources on Wayground

23 questions

Unit 6 Lesson 6.5: Triangle Similarity Theorems

Presentation

•

8th - 9th Grade

25 questions

Percent Change & Percent Error

Presentation

•

7th Grade

25 questions

SSAA Unit Review

Presentation

•

8th Grade

23 questions

Proportions using scale drawings

Presentation

•

7th Grade

21 questions

Triangles

Presentation

•

7th Grade

24 questions

Volume of Cones

Presentation

•

8th Grade

25 questions

Newton's 3rd Law of Motion

Presentation

•

8th Grade

24 questions

Similar Figures

Presentation

•

7th Grade

Popular Resources on Wayground

10 questions

Safety Day 2026 – Student Review

Quiz

•

9th Grade

21 questions

Continents and Oceans

Quiz

•

6th Grade

20 questions

Parts of Speech

Quiz

•

5th Grade

16 questions

Subject & Predicate

Quiz

•

5th Grade

25 questions

Multiplication Facts

Quiz

•

5th Grade

12 questions

Map Skills

Quiz

•

3rd Grade

22 questions

Continents and Oceans

Quiz

•

5th Grade

15 questions

Rounding Decimals

Quiz

•

5th Grade

Discover more resources for Mathematics

20 questions

Rational and Irrational Numbers

Quiz

•

8th Grade

20 questions

Add and Subtract Integers

Quiz

•

6th - 8th Grade

20 questions

Slope from a Graph

Quiz

•

8th Grade

15 questions

Adding and Subtracting Integers

Quiz

•

6th - 8th Grade

20 questions

Proportional vs. Non-Proportional

Quiz

•

8th Grade

14 questions

finding slope from a graph

Quiz

•

8th Grade

24 questions

Explore Rigid Transformations and Congruence

Quiz

•

8th Grade

13 questions

Finding slope from graph

Quiz

•

8th Grade