Lines, Line Segments, and Rays
This is a straight line that goes on and on in both directions.
A line
These lines are the same distance apart ALWAYS.
Parallel Lines
It has three sides and three angles.
Triangle
A 2 dimensional figure with three or more sides that is closed.
a polygon
A 90 degree angle.
right angle
This looks like a line, but has a beginning and end.
A line segment
These lines will cross.
Intersecting Lines
It has four sides and four angles.
Square, rectangle, quadrilaterals, rhombus
A four sided polygon.
quadrangle
An angle that is smaller than 90 degrees.
acute angle
This has a starting point, but goes on and on in one direction.
a ray
These lines are not touching, but if you extended them out, they would.
What are intersecting lines?
One of the line segments that make up a polygon.
side
An angle that is bigger than 90 degrees.
obtuse angle
This is named for the starting point and another point somewhere along the way and in that order.
A ray
An example is railroad tracks.
Parallel Lines
The corner, or point at which line segments meet in a polygon.
a vertex
A triangle with all sides equal.
equilateral triangle
These are stop along the way of a line, line segment, and ray, and are usually named with a letter.
Points
An example is an intersection with traffic lights.
Intersecting Lines
It has eight sides and eight angles.
an octagon
A quadrilateral with two pairs of opposite and parallel sides.
parallelogram
A triangle with two sides the same length.
isosceles triangle