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Introductory Geometric Vocabulary - Coggle Diagram
Introductory Geometric Vocabulary
Angles
By measure
Right
angles measure 90°.
Acute
angles measure <90°.
Obtuse
angles measure >90° and <180°.
Straight
angles measure 180°.
Pairs of angles
Complementary angles
add up to 90°.
Supplementary angles
add up to 180°.
Vertical angles:
angles opposite each other where two lines intersect.
Lines
Parts of a line
Line
Line segment:
a bounded, connected subset of a line.
Ray:
connected part of a line extending infinitely in one direction.
Pairs of lines
Parallel lines
are lines in the same plane that do not intersect (no matter how far extended).
Intersecting lines
have one (and only one) point in common.
Perpendicular lines
intersect at right angles.
Parallels cut by a transversal
Corresponding angles
Transversal:
a line that intersects two parallel lines.
Circles
Parts of a circle
The
radius
of a circle
C
is a line segment with two endpoints: 1) the center and 2) some point on
C
.
Circumference:
total length of a circle (
C
=2π
r
)
The
center
of a circle is the point which lies an equal distance from every point on the circle.
The
diameter
of
C
is the longest possible line segment between two points on
C
. Or, the length of that segment. (
d
=2
r
)
