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Lesson
Exercises
Recommended
Tests
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Concept
Standard Position of an Angle
An
angle
in the
coordinate plane
is in
standard position
if its
vertex
is at the
origin
and one
ray
is on the positive
x
-
axis. The ray on the
x
-
axis is called the
initial side
. The other ray is the
terminal side
of the angle.
The measure of an angle can be
positive
or
negative
.
If the terminal side is
rotated
counterclockwise
, then the measure of the angle is
positive
.
If the terminal side is rotated
clockwise
, then the measure of the angle is
negative
.
Move the slider to see how the angle measure changes.
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