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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