If the transversal cuts across parallel lines the usual case then the interior angles are supplementary add to 1800.

Meaning of co interior angles.
These angles do not share the same vertex yet they are congruent.
When two lines are crossed by another line the transversal a pair of angles on the inner side of each of those two lines but on opposite sides of the transversal are called alternate interior angles.
This is an important axiom in geometry.
Click on other angle pair to visit both pairs of interior angles in turn.
Try it and convince yourself this is true.
Click on consecutive interior angles to have them highlighted for you language note.
C and f are alternate interior angles.
Follow report by gujjar51 06082018 log in to add a comment answers jaiprakash111 ace.
A co exterior angle is almost the same thing as co interior.
Two angles on the same side of the transversal in a figure where two parallel lines are intersected by a transversal.
When the two lines are not parallel the sum of the two co interior angles would not be exactly 180 degrees.
D and f are consecutive interior angles.
5 points meaning of co interior angles ask for details.
The sum of a pair of co interior angles is always equal to 180 degrees if the two lines are parallel to each other.
Interior angle definition an angle formed between parallel lines by a third line that intersects them.
When the two lines are parallel any pair of consecutive interior angles add to 180 degrees.
So in the figure above as you move points a or b the two interior angles shown always add to 1800.
Meaning of co interior angles get the answers you need now.
So there are actually two pairs.
Co interior angles always lie on the same side of the transversal never on opposite sides.
C and e are consecutive interior angles.
D and e are alternate interior angles.
An example of congruent angles which are not vertical angles are the 3 interior angles of an equilateral triangle.
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