Like what you saw?
Create FREE Account and:
- Watch all FREE content in 21 subjects(388 videos for 23 hours)
- FREE advice on how to get better grades at school from an expert
- Attend and watch FREE live webinar on useful topics
Rays - ConceptFREE
Univ. of Wisconsin
J.D. Univ. of Wisconsin Law school
Brian was a geometry teacher through the Teach for America program and started the geometry program at his school
A ray is part of a line, has one fixed endpoint, and extends infinitely along the line from the endpoint. Opposite math rays are rays with a common endpoint, extending in opposite directions and forming a line.
If we had a line so it extends infinitely
in either direction, and I picked
an end point somewhere, and I erased everything
that extended beyond that
end point, what I've just
created is a ray.
So a ray has one end point and it extends
infinitely from that end point.
But how do you label a ray?
Well, you start off by saying
what is your end point?
My end point of this ray is A because that's
where it starts, and it extends
through point B. So I'm going to
label this ray A, B as a line but
I only have one arrow.
So the arrow is going
to be over the B.
Because my end point is A and notice I
do not have an arrow over the A, which
tells the geometry student or the geometry
teacher that this ray starts
at A and passes through B.
Now, you can also have opposite rays,
and opposite rays share
a common end point.
So if you look at this line right here,
containing X, Y and Z where X, Y and
Z are all co-linear.
We have opposite rays
if I pick point Y.
So I could say that the ray Y, Z -- so
again I'm saying from point Y through
point Z. So go YZ, and notice how
I level this where the arrow is
over the Z because it starts at Y and
the opposite one would be the ray
starting at Y passing
So I could label this as ray YX.
So opposite rays share an end point and
rays in general have one end point and
extend infinitely from
that end point.
Stuck on a Math Problem?
Ask Genie for a step-by-step solution
Please enter your name.
Are you sure you want to delete this comment?
- Using a Protractor 20,602 views
- Angle Bisectors 17,379 views
- Supplementary and Complementary Angles 24,896 views
- Polygons 16,884 views
- Types of Triangles 20,233 views
- Perimeter 11,425 views
- Parts of a Circle 14,288 views
- Three Undefined Terms: Point, Line, and Plane 64,882 views
- Counterexample 27,361 views
- Writing a Good Definition 17,448 views
- Postulate, Axiom, Conjecture 19,410 views
- Converse 14,983 views
- Line Segments 33,807 views
- Parallel and Skew Lines 31,305 views
- Midpoints and Congruent Segments 25,269 views
- Parallel Planes and Lines 23,163 views
- Vertex and Diagonals 15,773 views
- Calculating the Midpoint 20,744 views
- Angles: Types and Labeling 24,051 views