Year 3
To recognise obtuse and acute angles
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Lesson details
Key learning points
- 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
2 quarter turn
3 quarter turn
4 quarter turn
Q2.
A square contains how many right angles?
0
2
3
Q3.
In order to indicate that an angle is a right angle, what shape can we draw on the angle?
a semi-circle
a star
4 Questions
Q1.
Which angle is smaller than a right angle?
obtuse
Q2.
Which angle that we have been looking at today is greater than a right angle?
acute
Q3.
This triangle contains an obtuse angle. True or false?
True
Q4.
What type of angles are in this triangle?
Obtuse