Thursday, September 18, 2008
Geometry (Class 8)
Lesson Title
Segments and their Measures
Overview
In today’s class our warm-up focuses on measuring in centimeters, finding the area and perimeter of shapes, and then using this information to figure out a puzzle. A second part of the warm-up reviews the skills of identifying and naming segments as well as determining the length of segments on a number line. In the lesson we continue working with squares, areas, and measuring the distance between two points. We see that these ideas are actually connected and allow us to calculate the distance when we know the locations (coordinates) of any two points in the plane.
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 (#7)
Chapter 1- Lesson 2: Segments and Their Measure Practice #1-16
Txt. p.790 #21-25
Test Corrections for B3 & B4
Handouts
No Handouts Posted
Assignment
Chapter 1- Lesson 2: Segments and Their Measure Practice #17-34
Txt. p. 790 #26-29
For B2 Only-- Test Corrections
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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