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Transcript
"corner" Complementary Angles: two angles are complementary when they add up to 90 degrees (a right angle) "straight" Supplementary Angles: two angles are supplementary when they add up to 180 degrees (a straight angle) Adjacent Angles: two angles are adjacent if they have a common side and a common vertex (corner point) and they don't overlap; in other words, they are next to each other Vertical Angles: angles that are opposite each other when two lines cross are called vertical angles; they are equal in measure Naming Angles: we name angles using 3 points--one point on one side of the angle, the vertex (corner) point, and a point on the other side of the angle, in that order! the vertex is always in the middle! Angles formed by Parallel Lines and a Transversal: Corresponding Angles: angles that occupy the same position at their intersections; they are equal in measure Alternate Interior Angles: they lie inside the parallel lines on opposite sides of the transversal; they are equal in measure Alternate Exterior Angles: they lie outside the parallel lines on opposite sides of the transversal; they are equal in measure