geometry
DESCRIPTION
Geometry. By Miss O. 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. - PowerPoint PPT PresentationTRANSCRIPT
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GEOMETRY
B Y MI S
S O.
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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.
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GEOMETRY IS ANCIENT.The earliest records of geometry
can be traced to ancient Egypt and the Indus Valley from around 3000 BC.
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EUCLIDEuclid, 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.
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POINTAn exact location in space; named
by a capital letter
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LINEA straight path that extends
forever in opposite directions; named by two points on the line
RS
R
S
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LINE SEGMENTA part of a line with two
endpoints; named by the two endpoints
PZ
ZP Q
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PLANEA flat surface that extends without
end in all directions
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RAYA 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
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ANGLETwo rays joined at a common
endpoint called the vertex; named by the vertex or the vertex and a point on each ray
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VERTEXThe point on an angle or polygon
where two lines or rays meet; named with a capital letter
Vertex
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RIGHT ANGLE
90 degreesSquare cornerLittle box
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ACUTE ANGLELess than 90 degrees
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OBTUSE ANGLEMore than 90 degrees
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STRAIGHT ANGLE180 degreesStraight line
http://www.youtube.com/watch?v=yptZt9hwrzU&safety_mode=true&persist_safety_mode=1&safe=active
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ACTIVITY 1Build 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!
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ACTIVITY 2Play “Simon Says” with each hand motion that represents a
geometric term we learned today!
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INTERSECTING LINESLines that pass through the same
point
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PARALLEL LINESLines that never intersect
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PERPENDICULAR LINESLines that form right angles (90
degree angles)All perpendicular lines are also
intersecting lines!
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WHAT GEOMETRIC TERM IS REPRESENTED?
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WHAT GEOMETRIC TERM IS REPRESENTED?
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WHAT GEOMETRIC TERM IS REPRESENTED?
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WHAT GEOMETRIC TERM IS REPRESENTED?
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WHAT GEOMETRIC TERM IS REPRESENTED?
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WHAT GEOMETRIC TERM IS REPRESENTED?
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WHAT GEOMETRIC TERM IS REPRESENTED?
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WHAT GEOMETRIC TERM IS REPRESENTED?
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WHAT GEOMETRIC TERM IS REPRESENTED?
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WHAT GEOMETRIC TERM IS REPRESENTED?
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WHAT GEOMETRIC TERM IS REPRESENTED?
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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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FIND ALL THE ANGLES