1. ©2009 G Dear – Not to be sold/Free to use
Stage 4
Years 7 & 8
Angled between
Parallel Lines
Co-Interior
Angles
Press Ctrl-A
©2009 G Dear – Not to be sold/Free to use

2. C shape Co-interior Angles Co-interior Angles add to 180o. They make a
To see
them.
Press

3. C shape Co-interior Angles Co-interior Angles are equal. They make a
110o + 70o = 180o
110o + 70o = 180o
110o
70o

4. Two Co-interior Angles Exercisesbo
bo + 110o= 180o
ao + 70o= 180o
bo = 70o
ao = 110o
Co-interior Angles
in Parallel Lines. ao
110o