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point
a position in space, having to size; it is represented with a dot.

line
a set of points in one dimension that go forever in both directions.

ray
a line in one direction; there a starting point, and it goes forever

segment
a chunk of a line.

plane
a flat 2 dimensional surface.

vertex
the point where two or more rays intersector meet, forming an angle.

acute angle
angle less than 90 degrees.

obtuse angle
angle greater than 90 degrees.

right angle
an angle that measures exactly 90 degrees.

intersection (noun) or intersect (verb)
the point where two or more lines meet or cross.

straight angle
an angle that measures exactly 180 degrees.

number of degrees in a circle
A full circle measures exactly 360 degrees.

adjacent
next to
complementary angle
two angles that add up to 90 degrees.

supplementary angle
two angles that add up to 180 degrees.
