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Math Help - Construction of circle.

  1. #1
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    Smile Construction of circle.

    Questions I Don’t get.
    Hey guys new here. I’m from Nassau in the Bahamas. I’m a ninth grade student having trouble with math. In april I’ll be taking My Bahamas Junior certificates. Today I was tested to see how many hours of tutoring I need. I was given a past paper to complete. The lady said compared to a lot of other first timers I did pretty well. There were some questions I know I did in school but completely forgot they are the following please help me.

    18.
    A]= Use a pencil ruler and a compass to construct a circle with a radius of 4 cm. ( 1.6 inches, just about )

    B}= Insert the following in the previous construction
    Centre b
    Diameter ABY
    Radius BC

    and the following question for the first one i am to find the value of r the second is how to find the value of g. could u guys sort of break it down for me >

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  2. #2
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    Q18 is quite straightforward. Do you understand that a circle is all the point that are the same distance from the centre point? That distance is the radius.

    So open your compass, using your ruler to measure a 4cm opening, then draw your circle...


    For Q19, I assume that what you have put in the rectangles are the angle measurements.

    Angles in a straight line makes add up to \displaystyle 180^{\circ} and angles in a circle add up to \displaystyle 360^{\circ}.
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  3. #3
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    thank you!
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