Thread: Collinear Points

Show that A, O and D are collinear.

Can someone please help me, I forget how to do these!

Thanks.

Originally Posted by stellina_91

Show that A, O and D are collinear.

Can someone please help me, I forget how to do these!

Thanks.

if they are co-linear then the angle in between them all should be 180 and lo and behold 61+59+60=180