Thursday, December 13, 2007
Algebra (Class 36)
Lesson Title
Area Formulas of Polygons
Overview
During today’s class our warm-up continues to focus on develop our abilities to write and use equations of lines. A new concept we deal with is reflecting a shape across and axis. During our lesson focus on the area and perimeter of some common polygons by using our ability to dissect a polygon as the foundation for deriving formulas for area and perimeter.
Textbook Sections
§9-1 (Txt. p.413) The Graphing Method
Key Attitudes
Math is about investigating and confirming
Key Ideas
If a point is on a line, then it makes the equation for the line true.
The slopes of two lines are equal if and only if the lines are parallel.
The slopes of two lines are opposite reciprocals if and only if the two lines are perpendicular
The area formula for shapes can be figured out by cutting up the shape and rearranging it to form a rectangle or parallelogram.
Key Skills
Writing and using equations of lines.
Parallel lines have equal slope.
Finding the area of a polygon using a formula.
Finding the perimeter of a polygon using a formula.
Turn-In (#35)
Turn in #35
Txt. p.653 #13-15, 22-24, 53, 59, 65
Finish Packet through page SP 5
Finish Warm-Up (Plane Shapes #6)
Test Corrections
Handouts
Plane Shapes 7
Assignment
Txt. p.653 #16-18, 25, 26, 28, 29, 35, 38, 39
Finish Plane Shapes 7
Finish SP7 in the packet
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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