Year 3

To recognise obtuse and acute angles

Year 3

To recognise obtuse and acute angles

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Lesson details

Key learning points

  1. In this lesson, we will build on our angle knowledge by introducing the terms 'acute' and 'obtuse' for those angles which are smaller (acute) and greater (obtuse) than right angles. We will have time to look at these angles separately and within different shapes.

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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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3 Questions

Q1.
A right angle is a
Correct answer: 1 quarter turn
2 quarter turn
3 quarter turn
4 quarter turn
Q2.
A square contains how many right angles?
0
2
3
Correct answer: 4
Q3.
In order to indicate that an angle is a right angle, what shape can we draw on the angle?
a semi-circle
Correct answer: a square
a star

4 Questions

Q1.
Which angle is smaller than a right angle?
Correct answer: acute
obtuse
Q2.
Which angle that we have been looking at today is greater than a right angle?
acute
Correct answer: obtuse
Q3.
This triangle contains an obtuse angle. True or false?
An image in a quiz
Correct answer: False
True
Q4.
What type of angles are in this triangle?
An image in a quiz
Correct answer: Acute
Obtuse