Angle Flashcards
The figure formed by two straight lines drawn from the same point; The figure formed by two rays with the same endpoint
Angle
Two parts of an angle
Sides (the lines), Vertex (same/common endpoint)
What are the lines of an angle called?
Sides
What is the same/common endpoint of an angle called?
Vertex
Ways to name an angle
You can name an angle by
a point on each side and
the vertex in the middle.
∠CAB or ∠BAC
You can name an angle
by vertex.
∠A
You can name an
angle by number.
∠1
You can name an
angle by smaller
letter.
∠a
Two angles are said to be equal if
they can be made…
Coincide
The line through the vertex of an angle which
divides it into two equal parts
Bisector of an angle
An angle that
makes a complete
revolution
Perigon
An angle whose
sides form one
straight line
extending through
vertex
Straight Angle
Two angles that
have same
vertex and a
common side
between them
Adjacent Angles
Two equal adjacent angles formed by two straight lines. It is one half of a straight line.
Right Angles
An angle less than
a right angle
Acute Angle
An angle greater
than a right angle
but less than a
straight angle
Obtuse Angle
An angle greater
than a straight
angle but less
than a perigon
Reflex Angles
(symbol “ ⊥ “) Two lines that intersect and form right angles.
Perpendicular Lines
