Starter quiz
- Find: 180 − 47 = ______.
- '133' ✓
- Complete the sentence: 77° is ____________ angle.
- an acute ✓
- a right
- an obtuse
- a reflex
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- Which of these calculations gives a different answer to the others?
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-
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- ✓
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- Which of these is the most accurate description of a polygon?
- A 2D shape with at least one straight side.
- All 2D shapes that are not circles are polygons.
- A 2D shape made up from only straight line segments. ✓
- Triangles and squares are the only polygons.
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- Which of these properties of a polygon always remain invariant when the polygon is reflected?
- position
- size of angles ✓
- size of sides ✓
- sense
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- Which of these properties of a polygon always remain invariant when the polygon is positively enlarged?
- position
- size of angles ✓
- size of sides
- sense ✓
- orientation ✓
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Exit quiz
- The angles 119° and ° are supplementary angles. Find the size of angle °.
- 51°
- 61° ✓
- 231°
- 241°
- 251°
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The size of angle is measured accurately. Which of these values shows the size of angle , in degrees?- 7°
- 57°
- 83° ✓
- 93°
- 278°
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- The angles 167° and ° are conjugate angles. Angle ° is ______°.
- '193' ✓
- Match the angle name to its size.
- acute⇔32° ✓
- right angle⇔90° ✓
- obtuse⇔179° ✓
- reflex⇔182° ✓
- one full turn⇔360° ✓
Which of these statements about this diagram are accurate?- Angles ° and 125° are supplementary angles.
- Angles ° and 125° are conjugate angles. ✓
- = 55.
- is a major angle. ✓
- is a minor angle.
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QR is a line segment. Find the value of .- '327' ✓
Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- Angles that meet at a point can be identified in diagrams.
- Angles that make a straight line can be identified on a diagram.
- Vertically opposite angles can be identified on a diagram.
Common misconception
In order for two angles to be supplementary, they must both lie about a point on a straight line.
For two angles to be supplementary, they must sum to 180°. They do not also need to both lie on a straight line.
Keywords
Supplementary angles - Supplementary angles are a pair of angles that sum to 180°.
Conjugate angles - Conjugate angles are a pair of angles that sum to 360°.
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