Starter quiz
- The value of the angle marked is ______°.
- '128' ✓
- The value of the angle marked is ______°.
- '53' ✓
- Work out the value of .
- 12
- 61 ✓
- 85
- 168
-
- Which pair of line segments are equal in length in this diagram?
- AE ✓
- BF
- CG
- IJ ✓
- FG
-
- Alternate angles are a pair of angles both between or both outside two line segments that are on opposite sides of the ______ that cuts them.
- 'transversal' ✓
- Which of the following show a pair of equal corresponding angles?
Exit quiz
- Co-interior angles are on the ______ side of the transversal line and in between the two other lines.
- 'same' ✓
- Which of these diagrams show co-interior angles?
- Which pairs of angles are co-interior?
- ° and °
- ° and ° ✓
- ° and °
- ° and ° ✓
- ° and °
-
- If the co-interior angles are in parallel lines then the angles are ______.
- equal
- supplementary ✓
- conjugate
-
- The angle marked ° is ______° as ° and 118° are supplementary co-interior angles.
- '62' ✓
- Use this diagram to match pairs of supplementary co-interior angles.
- c⇔f ✓
- d⇔e ✓
- o⇔j ✓
- p⇔i ✓
- h⇔k ✓
- a⇔n ✓
Worksheet
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Presentation
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Lesson Details
Key learning points
- Co-interior angles can be identified in an arrangement of 3 line segments.
- If two of the lines are parallel then these angles are supplementary.
- Knowledge of co-interior angles can be used to find unknown angles.
- Knowledge of co-interior, corresponding and alternate angles can be used to find unknown angles.
Common misconception
Pupils may believe that the co-interior angles are equal, like alternate and corresponding angles.
Have pupils draw a pair of parallel lines and a transversal line themselves, identify the co-interior angles, are they equal?
Keywords
Co-interior - Co-interior angles are on the same side of the transversal line and in between the two other lines.
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