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    Mathematics
    Grade9
    Easy

    Question

    What is the circumference of the semi-circle, whose diameter is 56 cm?

    1. 144 cm    
    2. 88 cm    
    3. 176 cm    
    4. 124 cm    

    hintHint:

    Circumference of circle = 2 x 3.14 x r
    Circumference of circle =  3.14 x r

    The correct answer is: 144 cm

      R =fraction numerator D over denominator 2 end fraction=fraction numerator 56 over denominator 2 end fraction=28 cm.
      Full arc length of semi-circle =fraction numerator 1 over denominator 2 end fraction×(2×3.14×28) = 87.92 … 88 cm
      C = full arc length of semi-circle + diameter = 88 + 56 = 144 cm

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