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welcome to math with mr. J in this video
I'm going to cover how to name an angle
and we're going to go through two
examples together in order to get this
down so let's jump right into number one
here and the first thing we need to do
when naming an angle is find the vertex
and the vertex is where two lines or
line segments meet in order to create
the angle now the vertex is named by a
letter for number one we have a G here
corresponding to our vertex so after we
find the vertex we need to find a point
on each line segment or line that create
the angle so here we have a D this line
segment right here creates the angle and
this line segment here so we have a D up
there and we have a Z down here so once
we have the points on our line segments
and the vertex identified we are able to
name our angle so I'm going to start
here with the symbol that means angle
and now we start with one of our points
we're going to start with D so we start
with D here we go down to our vertex G
and then down to our other point on our
line segment Z so one of our names could
be angle D G Z now we can also start at
Z here go up the G so start at Z go up
to G and then finish by going up to D
now notice the order of our letters
represents the order of how we're
drawing that angle and the vertex is
always in the middle always in the
middle so we could either do angle D
GZ or angle Z G D now I'm going to give
you a couple of examples that do not
work we cannot do angle G Z D because if
we start at G and go down to Z and then
up to D that does not give us the angle
that we're looking for and we cannot do
D start at D no I'm sorry start a G go
up to D and then down to Z so we again
we cannot start a G go to D and then Z
the vertex needs to be in the middle so
let's go to number two here now this
looks a little different we have two
lines that intersect in order to create
angles so let's take a look at a down
here we need to find angle P F G so this
tells us start at P go to our vertex F
and end at Point G here so angle p FG
would be right here P F G so our angle
right here would be p FG now let's go to
B see if you can find angle G F a so we
started G we go into our vertex F and
then up to a so angle G FA would be
right here and then lastly see what is
another name for angle P F Y so p FY
would be right here P F Y another name
as long as we have the vertex in the
middle we could do Y F
P angle YF p start up top here F P so
there you have it there's how to name an
angle we find two points on the lines or
line segments and we also find that
vertex and we always put the vertex the
letter for the vertex in the middle of
our name
hopefully that helped thanks so much for
watching until next time peace
