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Vertical Angles
1
2
Isosceles Triangle
B
A
Two angles
opposite one
another at the
intersection of two
lines.
Two angles that
are congruent.
A triangle that has
at least two
congruent sides
Base angles are
congruent.
A triangle that has
all three sides
congruent.
All angles are
congruent.
A quadrilateral with
two pairs of parallel
sides.
Opposite sides
are congruent.
A parallelogram
with four right
angles.
Diagonals are
congruent.
A parallelogram
with four congruent
sides.
Opposite angles
are congruent.
AB = BC
C
Equilateral Triangle
F
E
D
Parallelogram
R
FR GH
F
H
GF HR
G
Rectangle
M
I
IM JK
IJ MK
J
Rhombus
K
M
N
O
P
Trapezoid
A quadrilateral with
exactly one pair of
parallel sides.
Q
P
S
Sum of interior
angles is 3600.
PS QR
R
Alternate Interior
Angles
1
Angles that are
Their interiors do
nonadjacent interior not intersect.
angles on opposite
sides of the
transversal.
2
Complementary
Angles
50
Two angles whose
measures add up
to 900.
Must be acute.
Two angles whose
measures add up
to 1800.
At least one of the
angles must be a
non–acute angle.
An angle of a
polygon that is
formed by a side
and the extension
of an adjacent side.
Two at each
vertex.
40
Supplementary
Angles
135
45
Exterior Angle
1
Convex Polygon
A polygon such that Diagonals contain
no side extended
no points outside
cuts any other side the polygon.
or vertex.
Perpendicular Lines
Two lines that
intersect to form a
right angle.
Form an angle
with measure
equal to 900.
Angle Bisectors
A ray that divides
an angle into two
congruent angles.
Angles have equal
measure.
Corresponding
Angles
A pair of angles in
similar locations
when two lines are
intersected by a
transversal.
May be congruent.
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2