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Geometry Concepts. Introduction Point, Line, Ray, Angles. Def: location in space Label with capital letter. Def: set of points extending infinitely in both directions Label two points on the line. AB. Point. Line. Point D. B. D. A. C. B. A. Plane. - PowerPoint PPT Presentation
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Geometry Concepts
Introduction Point, Line, Ray,
Angles
Point Def:
location in space
Label with capital letter
Def: set of points extending infinitely in both directions
Label two points on the line
DPoint D
AB
A
B
Line
BA
C
Plane Def: a flat surface extending
endlessly in all directions
plane BAC
Line Segment
Def: part of a line with two endpoints
Label the two endpoints
Def: part of a line, one endpoint, extends infinitely in one direction
Label endpoint and one other point
AB
C
D
Ray
A
B
CD
Angle Def: two rays with a common
endpoint, called the vertex Label and name in three ways
H
I
SHIS
I
SIH
H
S
vertex
Acute: 90o Right: 90
o
=
Obtuse:
Straight:90 and
o180
o
180o
=
Complementary angles:
o
Def: the sum of the measures of two angles = 90
50o
+ 40o
Supplementary angles:
180o
Def: the sum of the measures of two angles =
135
o+ 45
o
Parallel LinesDef: two lines in
the same plane that never intersect
Perpendicular LinesDef: two lines that intersect to form right angles
A
B
D
CAB CD
E
F
H
G
EF GH
Intersecting LinesDef: Two lines
that cross at a common point
Vertical AnglesDef: Opposite
pairs of congruent angles formed by intersecting lines
E
F
H
G
intersects at point PEF GH
P 3 4
1 2
3 4
1
2
Reflex Angleo
180 and 360o
Adjacent Angles
Def: two angles with a common vertex and a common side but no common interior points
1 2
1 and 2
are adjacent angles
Phew!!! That’s all, folks.
