geometry by miss o.. geometry (jee-om-i-tree) – n. the branch of mathematics concerned with the...
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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.
LINE
A straight path that extends forever in opposite directions; named by two points on the line
RS
R
S
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
STRAIGHT ANGLE
180 degrees
Straight line
http://www.youtube.com/watch?v=yptZt9hwrzU&safety_mode=true&persist_safety_mode=1&safe=active
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!
PERPENDICULAR LINES
Lines that form right angles (90 degree angles)
All perpendicular lines are also intersecting lines!
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!
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