Monday, September 22, 2008
Geometry (Class 9)
Lesson Title
Segments and their Measures
Overview
The warm-up for today comes in two parts. The first part is a continuation of the “Lots of Lots” problems we started working last week. The second part of the warm-up is a new type of problem which we will refer to as a “Model Drawing Problem”. In these problems the objective for the student is to translate the English sentences into a drawing which models the situation presented. Solving the problem is then accomplished with the help of this drawing. I am intending to do a lot of these sorts of problems throughout the year.
In the lesson today we continue with developing methods for determining the length of any line segment in the plane. Students created methods during the last class for doing this and we will practice and expand on these methods during this class.
Textbook Sections
§1.3 (Txt. p.17) Segments and their Measures
Vocabulary
length
distance
coordinates
ordered pair
diagonal
right triangle
leg(s) of a right triangle
hypotenuse
polygon
Key Attitudes
Math is about thinking creatively.
Key Ideas
The distance between points can be calculated.
The length of a line can be determined by thinking about it as a right triangle.
Key Skills
I can create a non-square rectangle, right triangle, or non-rectangular parallelogram on the coordinate plane when given the locations of two vertices of the shape.
I can determine the area of a figure drawn on dot paper.
I can create any of the possible squares whose vertices are on the dots of a 5 by 5 grid of dot paper.
I can determien the area of the square on the hypotenuse of a right triangle.
I can determine the length of the side of a square when I know the area of the square.
I can determine the length of a line segment using the locations of the endpoints of the segment.
Turn-In (#8)
Chapter 1- Lesson 2: Segments and Their Measure Practice #17-34
Txt. p. 790 #26-29
Handouts
No Handouts Posted
Assignment
Chapter 1- Lesson 2: Segments and Their Measure Practice #35-43
Txt. p. 790 #30-34
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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