Tuesday, April 13, 2010

Unit 9 Test Help

hw #9-5
1) Read 349-352
2) Clssrm Ex. #1-9
3) pg 354 #1-9
Posted by Mr. Chamberlain at 2:33 PM

8 comments:

  1. i dont understand #22, how to get the distance to the chord or how to get the radius. I also dont get the first part of 21

    CHRIS

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  2. For #21... look at the diagram... what if I renamed 'r' to 'a' and 'd' to 'b' and 'r+h' was = 'c'? Should be a theorem close to your heart, right?

    For #22, I assume you figured XP=3rad3 and AB=6 (based on Thm 9-13). You should be able to use Thm 9-10 (Case III) to set up an equation for angle-P. If you call arc-XA 'x' you should see a relationship to arc-AB, since chord-XA is cong. to chord-AB. It's really just some fun with Algebra.

    btw, for #22 on pg 360, you should set up a proportion where 7:x as 3:y and solve for x in terms of y or vice versa. Then you can use Thm 9-10 and have MORE FUN with Algebra!

    lmk how things go!

    Mr. C.

    ReplyDelete

  3. I understand both...#21 was simple now that I think about it...#22 I had to look really hard for 60 30 90 triangles, got the radius and it was simple from there with Pythag...For #22 I got AB=6, the distance from O to AB is 3rad3, and the radius is 6

    CHRIS

    ReplyDelete

  4. did you get #22 from pg 360?

    Mr. C.

    ReplyDelete

  5. I dont understand #17 on the chapter test...do you have to factor

    CHRIS

    ReplyDelete

  6. Nope... it's just a secant and a tangent, i.e. Thm 9-10 Case III...

    (PS)(PR) = (PT)^2

    so...

    18x = 12^2
    18x = 144
    x = 8

    right??

    ReplyDelete

  7. I know this isnt for chapter 9.... It is actually for chapter 10..
    I was wondering what the Homework is that is due on 5/11/10.
    All I know is that there is a teat on tues

    ReplyDelete

  8. see the new post for Chapter 10...

    ReplyDelete

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