Thursday, September 04, 2008
Geometry (Class 3)
Lesson Title
Points, Lines, and Planes
Overview
The warm-up for today continues the theme from the last class where students need to measure the lengths of segments using an inch ruler, scale these measurements based on a map, and then solve a puzzle based on these measurements. The lesson for the class is a continuation from last class. We justify why the sum of the measures of the interior angles of a triangle will always equal 180˚ using
Textbook Sections
§1.2 (Txt. p.10) Points, Lines, and Planes
Vocabulary
point
line
plane
undefined terms
line
line segment
ray
opposite ray
collinear
coplanar
distance
perpendicular
right angle
interior angle
exterior angle
Key Attitudes
Math is about thinking creatively.
Key Ideas
The shortest distance from a line to a point not on the line is equal to the length of the perpendicular segment from the point to the line.
Not sets of three line segments will make a triangle.
The sum of the interior angles of a triangle is 180˚.
Key Skills
I can determine the distance between a point and a line.
I can create a triangle using three line segments.
I can recognize and use basic geometry terminology.
I can sketch and uses sketches which represent a plane and the basic geometric objects related to the plane.
Turn-In (#2)
Txt. p.786 #2-24 Even
Txt. p.787 #2-30 Even
Handouts
No Handouts Posted
Assignment
Txt. p.789 #1-24
Disclaimer- The assignment as stated in class is the official assignment. Every effort is made to keep this posting accurate, but you should refer to what was stated in class as the final word.
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