Co-interior angles | Maths | Quizalize & Oak National Academy

Starter quiz

The value of the angle marked $a$ is ______°.

'128' ✓
The value of the angle marked $x$ is ______°.

'53' ✓
Work out the value of $m$ .

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?

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?

$a$ ° and $h$ °

$c$ ° and $f$ ° ✓

$b$ ° and $h$ °

$d$ ° and $e$ ° ✓

$c$ ° and $e$ °
If the co-interior angles are in parallel lines then the angles are ______.

equal

supplementary ✓

conjugate
The angle marked $n$ ° is ______° as $n$ ° 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 ✓

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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.

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?

Co-interior - Co-interior angles are on the same side of the transversal line and in between the two other lines.