Year 5

Year 5

# Comparing & classifying isosceles and scalene triangles

## Lesson details

### Key learning points

1. 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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## Worksheet

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## Starter quiz

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### 6 Questions

Q1.
Which properties do all triangles have?
2 sides and 3 vertices
3 sides and 2 vertices
Correct answer: 3 sides and 3 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
Correct answer: 3 angles, where each angle is equal to 60 degrees
3 sides with different measurements
Q4.
Which statement best describes a right angled triangle
Correct answer: 1 angle that measures to 90 degrees
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
Correct answer: 4 or 9 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

## Exit quiz

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### 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?
Correct answer: 40°, 55° and 75°
60°, 60° and 60°
70° , 70° and 40°
Correct answer: 80°, 20° and 70°
Q5.
A right angled triangle can also be ...
a scalene or an equilateral triangle
Correct answer: a scalene or isosceles triangle
an equilateral triangle
an isosceles or an equilateral triangle