Wednesday, April 23, 2008
Geometry (Class 73)
Announcements
Next test is next Friday, April 26. The following test will not be until May 23 due to STAR testing-- that test will cover a lot of material!
Lesson Title
Intersecting Chords of a Circle
Overview
The warm-up today focuses on applications of the formula for the volume of a cone. In our lesson we will learn how the lengths of chords which intersect inside a circle are related.
Textbook Sections
§10.5 (Txt. p.629) Segment Lengths in Circles
Vocabulary
center
inscribed angle
central angle
radius (pl: radii)
chord
diameter
sections of intersecting chords
Key Attitudes
Math is about thinking creatively.
Key Ideas
If two chords intersect in the interior of a circle, then the products of the lengths of the sections of one chord is equal to the product of the lengths of the sections of the other chord.
The volume of a cone is equal to one-third the product the area of its base and height.
Key Skills
I can recognize intersecting chords and recall the relationship between their lengths.
I can explain why the product of the sections of intersecting chords is equal.
I can use the relationship between the lengths of the sections of intersecting chords to solve problems.
I can identify the various parts of a cone.
I can use the formula for the volume of a cone to solve applied problems.
Turn-In (#72)
Finish Warm-Up (Cone 5)
Finish Chapter 10-Lesson 2
Txt. p.599 #9, 13, 17, 18-25
Handouts
Chapter 12- Cone 5
Chapter 10- Lesson 3: Intersecting Chords
Assignment
Finish Cone 5- Problems
Txt. 600 #36-41, 46-48
Txt. p.608 #32-41
CST Practice 4 All (Problems 64-74)
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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