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Geometry Vocabulary with pictures 8-1 to 8-3
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Gravity
Terms in this set (25)
line
A straight path that goes without end in two directions.
parallel lines
lines in the same plane that never intersect
intersecting lines
lines that meet or cross at a point
perpendicular lines
Lines that intersect to form right angles and measure 90.
line segment
A part of a line with two endpoints
ray
A part of a line, with one endpoint, that continues without end in one direction
right angle
90 degree angle that makes a square corner
acute angle
an angle that measures less than 90 degrees (less than a right angle)
obtuse angle
An angle that measures more than 90 degrees but less than 180 degrees (more than a right angle but less than a straight angle
straight angle
an angle that measures 180 degrees (forms a straight line)
endpoint
A point at one end of a segment or the starting point of a ray.
angle
The point where two lines meet
congruent
Having the same size and shape
complimentary angles
Two angles that add up to 90 degrees
supplementary angles
Two angles whose sum is 180 degrees
skew lines
lines that do not intersect and are not parallel, they exist in different planes
adjacent angles
2 angles that have a common vertex and a common side
vertical angles
2 angles opposite one another when the lines intersect.
transversal
a line that intersects two or more parallel lines.
corresponding angles
2 angles that are on the same side of the traversal and are both above or below the parallel lines
alternate interior angles
angles located inside the parallel lines on opposite sides of the traversal.
alternate exterior angles
angles located outside the parallel lines on the opposite sides of the traversal.
Vertex
the common endpoint of an angle
Point
an exact location usually represented by a dot.
Plane
a perfectly flat surface extending infinitely in all directions.
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