# Classifying triangles

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## Lesson details

### Key learning points

- In this lesson, we learn how to describe the properties of scalene, isosceles and equilateral triangles. We will also learn how to identify and classify triangles inscribed in circles.

### Licence

This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.

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### 6 Questions

Q1.

Decide if the statements are always true, sometimes or never true: All quadrilaterals have 4 lines of symmetry.

Always true

Never true

Q2.

Decide if the statements are always true, sometimes or never true: The number of lines of symmetry a polygon has is more than its number of sides.

Always true

Sometimes true

Q3.

Decide if the statements are always true, sometimes or never true: A regular polygon has as many lines of symmetry as it does sides.

Never true

Sometimes true

Q4.

Decide if the statements are always true, sometimes or never true: The number of lines of symmetry a polygon has is the same as its order of rotational symmetry.

Always true

Never true

Q5.

How many lines of symmetry does a parallelogram have?

1

2

4

Q6.

How many lines of symmetry does the shape below have?

1

2

### 6 Questions

Q1.

What is a triangle with at least two equal sides called?

Equilateral triangle

Obtuse triangle

Scalene triangle

Q2.

What is a triangle with three equal sides called?

Isosceles triangle

None

Scalene triangle

Q3.

Would it be possible to draw a scalene triangle with more than one obtuse angle?

Yes, this will be possible

Q4.

The sum of all the angles of a triangle is:

100 degrees

360 degrees

90 degrees

Q5.

Zaki and Connor are looking at the diagram on the right. Who do you agree with? Why?

Connor

Neither of them

Q6.

I am thinking of a triangle which have the following properties: no lines of symmetry and has one right angle. Which triangle am I thinking of?

Equilateral triangle

Isosceles triangle