Vertical angles - it is a pair of opposite angles formed by intersecting lines, Parallel lines - lines that do not intersects, Supplementary angles - Are those angles that sum up to 180 degrees, Congruent - It means having Identical shape, size and dimension, Proof - An inferential argument for mathematical statement that stated assumption that guarantee the conclusion, Same side Exterior angles - Two exterior angles that are on the same side of the transversal, Alternate Interior angles - Two nonadjacent interior angles that are on opposite sides of the transversal,

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