All the angles

Today grade 9s explored transversals (sécantes) and the angles created as the line cuts a pair of parallel lines.

There are many congruent angles produced. Above, note how the green and blue are opposite each other for each x pattern?  They are called opposite angles “les angles opposés par le sommet”

 Here are “alternating internal angles” or alternes-internes that follow a z pattern.

Here are corresponding angles (les angles corréspondantes) that follow an f pattern.

There are angles that are supplementary that are on the inside of a c pattern.