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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.

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)

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

protractor
a tool used to measure angles

reflex angle
an angle that is greater than 180 degrees because the angle is bent beyond the straight line

quadrilateral
a polygon with four sides

trapezoid
A quadrilateral with exactly one pair of parallel sides

hexagon
6 sided polygon

parallegram
a quadrilateral with both pairs of opposite sides parallel
polygon
A closed plane figure made up of line segments
triangle
A polygon with three sides.
isosceles triangle
A triangle that has 2 equal sides.

scalene triangle
A triangle with no equal sides

equalateral triangle
a triangle with all equal sides

square
A quadrilateral with 4 sides that are equal and has all 90 degree angles

rectangle
A parallelogram with four right angles

rhombus
a parallelogram with 4 congruent sides
