Visual Dictionary
Thursday, September 27, 2012
Plane
a flat, two-
dimensional
surface
.
Point
A precise location or place on a plane. Usually represented by a dot.
Perpendicular Lines
A line is perpendicular to another if it meets or crosses it at right angles (90°).
Image
Real world example
Supplementary Angles
either
of
two
angles
that
added
together
produce
an
angle
of
180°.
Congruent
Two figures or objects are congruent if they have the same
shape
and size, or if one has the same shape and size as the mirror image of the other.
Image
Real world example
Vertical Angles
one
of
two
opposite
and
equal
angles
formed
by
the
intersection
of
two
lines.
Parallel Lines
Two lines on a plane that never meet. They are always the same distance apart.
Collinear
Points that are on the same line
Image
Real life example
Skew Lines
any
lines
in
space
that
do
not
intersect
and
are
not
parallel.
Coplanar
Points and/or lines in the sa
me plane.
Image
Real Life Example
straight angle
an
angle
of
180°.
Right Angle
the
angle
formed
by
two
perpendicular lines
that
intersect;
an
angle
of
90°.
Line
A string of points that go opposite direction.
Image
Real World Example
Acute Angle
An
angle
whose
measure
is
between
0°
and
90°
Tuesday, September 18, 2012
Obtuse Angle
an
angle
greater
than
90°
but
less
than
180°.
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