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An angle.A vertex is the common endpoint of two rays. Vertex typically means a corner or a point where lines meet. For example a square has four corners, each is called a vertex.
No, its an angle, not a vertex. I promis:)
Anonymous ∙
Joseph West ∙
angle
Octagon
poop
An angle.
An angle
A right angle (90 degrees).
an angle
Angle
a rainbow 
Yes. Any two rays which have the same end point.
A line
an acute ray