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### 15 Cards in this Set

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• Back
 Plane a flat surface without thickness, extending in all directions adjacent angles two angles with a common side, a common vertex and no common points within the angles perpendicular lines lines that intersect to form right angles parallel lines lines in the same plane that never interesect congruent angles angles that have the same measure right angle has a measure of 90 degrees intersecting lines lines that meet or cross line segment all the points on the straight path between two points, ioncluding those two points called endpoints straight angle (supplemementary angles) has a measure of 180 degrees, its sides form a straight line obtuse angle has a measure greater than 90 degrees but less than 180 degrees Perpendicular lines two lines that intersect and form right angles Line a line that continues in both directions Ray a line that has an endpoint and extends on in one direction Point a dot Complementary angles its angles combine to a measure of 90 degrees