Download Geometry

GEOMETRY (JEE-OM-I-TREE) – N.
The branch of mathematics concerned with the
properties of and relationships between
points, lines, planes, and figures.
GEOMETRY IS ANCIENT.
The earliest records of geometry can be traced
to ancient Egypt and the Indus Valley from
around 3000 BC.
EUCLID
Euclid, a Greek mathematician, wrote The
Elements of Geometry.
He presented geometry in a practical form
known as Euclidean geometry Euclid’s was
not the first important early texts on
geometry.
POINT
An exact location in space; named by a capital
letter
LINE
A straight path that extends forever in opposite
directions; named by two points on the line
RS
S
R
LINE SEGMENT
A part of a line with two endpoints; named by
the two endpoints
PZ
P
Q
Z
PLANE
A flat surface that extends without end in all
directions
RAY
A part of a line with one endpoint that extends
forever in one direction; named by the
endpoint first followed by another point on
the ray
ANGLE
Two rays joined at a common endpoint called
the vertex; named by the vertex or the vertex
and a point on each ray
VERTEX
The point on an angle or polygon where two
lines or rays meet; named with a capital
letter
Vertex
RIGHT ANGLE
90 degrees
Square corner
Little box
ACUTE ANGLE
Less than 90 degrees
OBTUSE ANGLE
More than 90 degrees
STRAIGHT ANGLE
180 degrees
Straight line
http://www.youtube.com/watch?v=yptZt9hwrzU&safety_mode=true&persist
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ACTIVITY 1
Build all 4 angles with your bodies on the carpet. Each group will have 4 students in
it.
Miss O. will come around to take a photo of each angle for the website!
ACTIVITY 2
Play “Simon Says” with each hand motion that represents a geometric term we
learned today!
INTERSECTING LINES
Lines that pass through the same point
PARALLEL LINES
Lines that never intersect
PERPENDICULAR LINES
Lines that form right angles (90 degree angles)
All perpendicular lines are also intersecting
lines!
WHAT GEOMETRIC TERM IS REPRESENTED?
WHAT GEOMETRIC TERM IS REPRESENTED?
WHAT GEOMETRIC TERM IS REPRESENTED?
WHAT GEOMETRIC TERM IS REPRESENTED?
WHAT GEOMETRIC TERM IS REPRESENTED?
WHAT GEOMETRIC TERM IS REPRESENTED?
WHAT GEOMETRIC TERM IS REPRESENTED?
WHAT GEOMETRIC TERM IS REPRESENTED?
WHAT GEOMETRIC TERM IS REPRESENTED?
WHAT GEOMETRIC TERM IS REPRESENTED?
WHAT GEOMETRIC TERM IS REPRESENTED?
TALK AND TURN:
In the world around you, where do you see geometric figures in real life every day?
Make a list with your partner of at least 3 ways!
FIND ALL THE ANGLES