Year 5

# Comparing & classifying isosceles and scalene triangles

Year 5

# Comparing & classifying isosceles and scalene triangles

## Slide deck

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## Lesson details

### Key learning points

- In this lesson, we will compare different triangles and introduce isosceles and scalene triangles.

### 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.

## Video

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### 6 Questions

Q1.

Which properties do all triangles have?

2 sides and 3 vertices

3 sides and 2 vertices

4 sides and 4 vertices

Q2.

What is the name given to a regular triangle?

Regularity

Right angled triangle

Trapezium

Q3.

Which of the statements best describe an equilateral triangle?

1 angle equal to 90 degrees

2 angles equal to 180 degrees

3 sides with different measurements

Q4.

Which statement best describes a right angled triangle

3 angles that measure exactly the same

A triangle with a width of 10cm

A triangle with three 60 degree angles

Q5.

It is possible to create a large equilateral triangle from either...

2 or 4 smaller equilateral triangles

3 or 5 smaller equilateral triangles

6 or 9 smaller equilateral triangles

Q6.

If a triangle has the angles: 60 degrees and 30 degrees, what is the 3rd angle?

180 degrees

30 degrees

60 degrees

### 5 Questions

Q1.

What is the name given to a triangle with 3 equal sides?

Right angled triangle

Scalene triangle

Trapezium

Q2.

What is the name given to a triangle which has the following three angles: 80°, 40° and 60° ?

Equilateral triangle

Isosceles triangle

Right angled triangle

Q3.

If a triangle has the angles of 90° and 60°, what is the third angle?

180°

40°

90°

Q4.

Which of these are NOT interior angles of a triangle?

60°, 60° and 60°

70° , 70° and 40°

Q5.

A right angled triangle can also be ...

a scalene or an equilateral triangle

an equilateral triangle

an isosceles or an equilateral triangle