acute angle , less than 90 degree angles, by the vertex, there points with the vertex in the center, A vertex is a point where two lines or edges meet. Example:, : A in triangle ABC., Right angle, measures 90°, Obtuse angle, measures more than 90° but less than 180°, Obtuse angle:, measures more than 90° but less than 180, Straight angle, measures 180°, Congruent angles:, have the same measure., Adjacent angles:, share a vertex and a side., Angle Addition Postulate:, the sum of two adjacent angles equals the whole angle., Angle Bisector:, a ray that divides an angle into two equal parts., Vertical angles:, are opposite angles formed by intersecting lines and are equal., Complementary angles:, add up to 90°, Supplementary angles:, add up to 180°., Linear pair:, two adjacent angles that form a straight line (180°)..

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