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A linear pair is formed when two adjacent angles have their non-common side in opposite rays. Their measures will always add up to 180 degrees. Vertival angles are formed by two intersecting lines. Two pairs are formed; they are across from each other (not adjacent), and are congruent.
= = =. Notice the size and shape of the new pairs of triangles remains the same. The patterns you may have observed and need to know for congruent triangles are displayed below. Remember  â  means is congruent to. Two triangles are congruent if: 1  all 6 pairs of corresponding angles and sides are congruent.