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Points, Lines, Rays, Angles
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Terms in this set (17)
point
A "dot" on a line that shows exact location.
line
A straight path of points that continues forever in both directions. There is an arrow on each end to show that it continues on and on.
line segment
A part of a line. There is an endpoint on each end of the segment.
ray
a part of a line that has one endpoint and one arrow. It begins at the end and continues forever in one direction only.
plane
a flat surface. A 2-D shape that has length and width.
horizontal
a line, or segment, or ray that goes straight ACROSS - (like east to west)
vertical
a line, or segment, or ray that goes straight UP AND DOWN -( like north to south)
oblique lines
a line, or segment, or ray that is NOT horizontal and NOT vertical. It is SLANTED.
parallel lines
2 or more lines that are ALWAYS the same distance apart from each other and never cross
intersecting lines
2 or more lines that DO cross at some point
perpendicular lines
2 or more lines that cross (intersect) in a special way. Where they cross forms a SQUARE CORNER - or right angle (90 ).
vertex
the endpoint where 2 rays meet to form an angle
angle
a SHAPE formed by 2 rays that share the same endpoint
right angle
an angle that (opens up) - EXACTLY 90 degrees. There is a "square" corner.
acute angle
an angle that opens up LESS than a right angle
obtuse angle
an angle that opens up MORE than a right angle
straight angle
an angle that is straight - measures 180
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