Thursday, April 02, 2009
Geometry (Class67)
Lesson Title
Special Right Triangles (2)
Overview
The opener today focuses on developing fluency with solving quadratic equations by completing the square. The lesson continues with uncovering the key relationships related to special right triangles.
Textbook Sections
§9.4 (Txt. p.551) Special Right Triangles
Vocabulary
right triangle
leg
hypotenuse
special right triangle
trigonometry
isosceles right triangle
equilateral triangle
equiangular triangle
45-45-90 triangle
30-60-90 triangle
Key Attitudes
Math is about building up understanding one idea at a time.
Key Ideas
Certain right triangles are special-- we can figure out the lengths of all three sides when we know the length of only one side.
A 30-60-90 triangle can be created by folding an equilateral triangle.
A 45-45-90 triangle can be created by folding a square.
Key Skills
I can find the length of the missing two sides of a 45-45-90 right triangle when I know the length of the remaining side.
I can find the length of the missing two sides of a 30-60-90 right triangle when I know the length of the remaining side.
Turn-In (#66)
Txt. p.493 #15-25, 32, 33
Handouts
No Handouts Posted
Assignment
No Homework
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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