Sunday, April 11, 2010

Unit 9 Circles HW HELP!

Posted by Mr. Chamberlain at 8:37 PM

4 comments:

  1. These questions were received from max and DALPE!

    max said... not sure where to put it... but i need help with #'s 11 and 13 on pg 247
    April 11, 2010 3:41 PM

    Anonymous said...
    Max dont you mean pg 347???
    And for problem #10 on page 342, is angle 2 supposed to be angle CAO or angle COA??
    DALPE

    ReplyDelete

  2. To use these answers effectively (and thereby induce you to think) stop after each step/hint to see if you can do the problem on your own.

    For #11:
    a) you can draw a radius as a perp bisector thru the chord, yes?
    b) you can draw a radius to the endpoint of each chord, yes?
    c) you gotsk yourself a right triangle now AND you know 2 sides, eh Pythagoras, yes?

    For #13:
    a) Similar to #11 except that your unknown side is different... the Py Thm gets you there... DRAW THE DIAGRAMS and the RIGHT TRIANGLES should POP 4U!!

    For #10 on pg 342, angle 2 is CAO.

    lmk if this helped,
    Mr. C.

    ReplyDelete

  3. I dont get #21 page 248

    CHRIS

    ReplyDelete

  4. When the math gods say "use trigonometry" they always mean that you need to find a RIGHT TRIANGLE AND that you will need to either know the lengths of two sides, OR the length of one side and one angle (besides the right angle, of course).

    So, you gotsk to draw a picture.

    1) Draw a circle with a radius 10
    2) Draw a chord 12 cm (clearly, this chord is not a diameter, yes?)
    3) Here is the "trick"... there is one and only one radius that can be drawn thru the chord that is the PERENDICULAR BISECTOR of that chord. DRAW IT!
    4) So here are the questions... Can you draw an auxiliary line(s) that create a right triangle? (Yup)... Do you know enough info about the triangle to use TRIG? (Yup again)
    Hint: To use TRIG, you'll need the table on pg 311 or a TRIG function calculator

    lmk if this helped...

    Mr. C.

    ReplyDelete

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