# Compare and order acute, obtuse and reflex angles

## Lesson details

### Key learning points

1. In this lesson, we will learn about reflex angles, and then consider how to compare and order acute, obtuse and reflex angles.

### 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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### 5 Questions

Q1.
REVISION: Which of these angles is obtuse?
1
2
Q2.
Which is the smallest angle?
2
3
4
Q3.
Is this statement always, sometimes or never true: "I can draw a triangle with 2 obtuse angles"
Always true.
Sometimes true.
Q4.
How many acute, obtuse and right angles are there in this shape?
2 obtuse, 0 acute, 3 right angles.
2 obtuse, 3 acute, 0 right angles.
Correct answer: 3 obtuse, 0 acute, 2 right angles.
3 obtuse, 2 acute, 0 right angles.
Q5.
Is this statement always, sometimes or never true: "A quadrilateral has 4 acute angles"
Always true
Sometimes true

## Exit quiz

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### 5 Questions

Q1.
A numberline starting at 0 and ending at 10 is divided into 10 equal parts. Each equal part represents:
one tenth
ten
Q2.
A numberline starting at 0 and ending at 100 is divided into 10 equal parts. Each equal part represents:
one
one tenth
Q3.
A numberline starting at 0 and ending at 1 is divided into 10 equal parts. Each equal part represents:
one
ten
Q4.
A container is filled with four colours of sand. 0.3 of the container is blue, 0.1 is black. Which decimals could represent the yellow and white sand?
0.1 and 0.4