9.1

Example 1 answers:


  1. The radius can be: GD, ED, CD, or DF.
  2. The Diameter is CE.
  3. The chord is AB.
  4. The arc is EF and it is a minor arc (less than 180°)

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9.2

Example 2 answers:

(AE)²+7²=9²
(AE)²=9²-7²
(AE)²= 32
(square root of 32)
AE= 5.66
By the Radius and Chord theorem, AB bisects CD, so DE= CE=4. Therefore, CD=BE+DE= 5.66+5.66= 11.31(CD)

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9.3

Example 3 answers:

78°/2=39°

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9.4

Example 4 answers:

  1. 120°/2=60°
  2. 89°/2=44.5°

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9.5

Example 5 answers:

  1. 12
  2. 12

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9.6

Example 6 answers:

  1. (x-4)²+(y+7)=36 -4 and +7 are the opposites of the center of the circle.
    36 is the radius squared.
  2. x²+y²=25
To get the intercepts you use the radius (5). The center is 5 away from the intercept.
scdgraphscd.JPG
(Created by Shelby)

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