line	straight row of points that goes on forever in both directions
line segment	a piece of a line with two endpoints
ray	part of a line that has one endpoint and extends forever in one direction
parallel lines	two lines that never intersect and are equal distant from each other
intersecting lines	lines that cross
angle	two rays that have a commom endpoint called the vertex
degrees	a system used to measure angles in which a complete circle is 360 degrees
straight angle	an angle that measures 180 degrees, forms a straight line
right angle	an angle that measures 90 degrees
acute angle	and angle that measures between 0 and 90 degrees
obtuse angle	an angle that measures between 90 and 180 degrees
perpenndicular lines	two lines that intersect to form a right angle
complementary angles	two angles whose sum is 90 degrees
supplementary angles	two angles whose sum is 180 degrees
congruent angles	angles that measure the same number of degrees
point	a location in space
vertical angle	two nonadjacent angles formed by intersecting lines
perimeter	the distance around the edges of a figure, measured in linear units, ft, yd, cm, etc
area	surface covered by a two-dimensions figure, measured in square ft, square m, etc
rectangle	four sided figure with all sides meeting at 90 degree angles
square	a rectangle with all four sides the same length
parallelogram	four-sided figure with both pairs of opposite sides parallel
trapezoid	four sided figure
triangle	a figure with three sides
circle	figure with all points the same distance from a fixed center point
radius	distance from the center to any point on the circle
diameter	distance across the circle, passing through the center
circumference	see picture                distance around a circle
volume	space inside a 3D object, measured in cubic feet, cubic meters , etc
	ratio of circumference to diameter of a circle

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