Monday, December 17, 2007
Algebra (Class 37)
Lesson Title
Area Formulas of Polygons
Overview
In today’s class students continue to refine their ability to write and use equations of lines. In addition we continue our work with area formulas and use the concept of area to establish the relationship between the area and length of the side of a square. Students then learn to approximate the value of the square root of a number by comparison to perfect squares and by using a calculator.
Textbook Sections
§9-1 (Txt. p.413) The Graphing Method
Key Attitudes
Math is about investigating and confirming
Key Ideas
The coordinates of the point of intersection of two lines is the solution to both equations simultaneously.
Equations can be used to verify the point of intersection by substituting and evaluating the equations. If both equations “work” with these values, then the point is the point of intersection of both lines-- otherwise it is not.
The length of the side of a square can be found by taking the square root of the area of the square.
Only “perfect squares” have whole number square roots.
Only positive numbers have square roots, but all numbers can be squared.
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 (#36)
Turn in #36
Txt. p.653 #16-18, 25, 26, 28, 29, 35, 38, 39
Finish Plane Shapes 7
Finish Packet through SP 6
Handouts
Plane Shapes 8
Assignment
Txt. p.653 #19, 20, 30-34, 60, 66
Packet through SP11
Plane Shapes 8
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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