Glossary – Venema
Angle: An angle is the union of two nonopposite rays
AB
uuur
and
AC
uuur
sharing the same
endpoint.
The angle is known as
or
BAC
CAB
∠
∠
.
The point A is
called the vertex and the rays
AB
uuur
and
AC
uuur
are called the sides of
the angle.
p. 48
EDF
∠
is a right angle if
μ
(
EDF
∠
) = 90º.
EDF
∠
is an acute angle if
μ
(
EDF
∠
) < 90º.
EDF
∠
is an obtuse angle if
μ
(
EDF
∠
) > 90º.
p. 53
Two angles
ABC
∠
and
EDF
∠
are supplementary if
μ(
ABC
∠
) +
μ(
EDF
∠
) = 180º.
p. 58
Between:
Let
A
,
B
, and
C
be three distinct points.
The point
C
is between
A
and
B
, written
A
*
B*C
, if
A
,
B
, and
C
are collinear and AC + CB =
AB.
p. 37
Ray
AD
uuur
is between rays
AB
uuur
and
AC
uuur
if
D
is in the interior of
BAC
∠
.
p. 49
Circle: Given a point
O
and a positive real number
r
, the circle with center
O
and radius
r
is defined to be the set of all points
P
such that the distance from
O
to
P
is
r
.
p. 44
Collinear:
Three points
A
,
B
, and
C
are collinear if there exists one line
l
such
that all 3 points all lie on
l
.
The points are noncollinear otherwise.
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 Spring '08
 Staff
 rays AB

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