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15 Cards in this Set

  • Front
  • Back
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
a line that continues in both directions
a line that has an endpoint and extends on in one direction
a dot
Complementary angles
its angles combine to a measure of 90 degrees