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right angle an angle that measures 90 degrees vertical angle the opposite angles where two lines meet complementary angles two angles whose sum is a right angle, angles that add up to 90 degrees supplementary angles two angles whose sum is 180 degrees congruent angles angles with the same measure intersecting lines lines that meet at one point, Lines that cross at exactly one point parallel lines lines in the same plane that never intersect transversal a line that intersects two or more lines. angle consists of two rays that begin at the same point line a straight path of points that extends without an end in opposite directions line segment a part of a line between two endpoints vertex the point at the corner of an angle, plane figure or solid figure acute angle an angle that measures between 0 and 90 degrees obtuse angle an angle that measures between 90 and 180 degrees straight angle an angle that measures 180 degrees only (remember 180 degrees only) adjacent angle side by side angles that share a common vertex and a ray.