When two triangles are congruent they will have exactly the same three sides and exactly the same three angles. The equal sides and angles may not be in the same position (if there is a turn or a flip), but they are there
A supplementary angle is an angle in which two of it's measurements can be added to equal 180 degrees. For example, a measure of 130 and a measure of 50 in the same shape. They can both be added to equal 180.
