Angle is the union
of two noncollinear rays
that have a
common endpoint.
The endpoint of an
angle is called
vertex, while the
two rays are called
the sides of the
angle or arm.
An Angle separate
the points into three
areas.
An Angle separate the
points into three areas.
• Interior
• Exterior
• Angle itself
Interior of an
angle. This is set of
points which are
bounded within the
two sides of the
angle.
Interior of an angle. This
is set of points which are
bounded within the two
sides of the angle.
Interior points are
Point D, A and F
Exterior of an
angles. This is a set
points that are not
bounded within the
two sides of the
angle.
Exterior of an angles.
This is a set points that
are not bounded within
the two sides of the
angle.
Exterior points are
Points B and C
Angle Itself – this
is a set points that
lie on the sides of
the angle including
the vertex.
Angle Itself – this is a
set points that lie on
the sides of the angle
including the vertex.
Points G, Q, E, R
How are angles
named?
Three points. We will
use a distinct point on
each side of the angle
and vertex.
Note: the vertex must
be written in middle.
Three points. We will use a
distinct point on each side
of the angle and vertex.
Note: the vertex must be
written in middle.
∠𝐴𝐵𝐶 𝑜𝑟 ∠𝐶𝐵𝐴
Vertex. We can
name angle using
its vertex.
Vertex. We can
name angle using
its vertex.
∠𝐵
Symbol or
notation. In naming
angles, we can also
use specified
symbols or
numbers.
Symbol or notation.
In naming angles, we
can also use
specified symbols or
numbers.
∠1