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15 Cards in this Set
 Front
 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
