Friday, April 25, 2008
Geometry (Class 74)
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 for today focuses on using the concepts and skills related to surface area and volume to find the surface area of an octagonal pyramid. During the lesson we continue to develop the ideas related to the lengths of intersecting chords of a circle. During the last part of the class we write test 11.
Textbook Sections
ยง10.5 (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 (#73)
Finish Cone 5- Problems
Txt. 600 #36-41, 46-48
Txt. p.608 #32-41
CST Practice 4 All (Problems 64-74)
Handouts
Surface Area of Octagonal Pyramid
Chapter 10- Lesson 3: Intersecting Chords
Assignment
Finish Warm-Up (Finding the surface area of an Octagonal Pyramid)
Finish Chapter 10- Lesson 3
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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