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Measurement (Pri-6)

/ Circles Methodist Girls' School (Primary) / Others (2018)
is the centre of the large circle and AO is the diameter of the small circle The diameter of the large circle is 2 times the diameter of the smal circle The circumferences of the big and small circles meet each other at point A The perimeter of the shaded small circle? figure is 30π cm, what is the diameter of the
Ma

September 27, 2018
 
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Dia of small circle = dDia of large circle = 2dPerimeter of small circle = 2πr = πdPerimeter of large circle = 2πR = 2πdPerimeter of shaded -> 2πd - πd = 30ππd = 30πd = 30 cm  (ans)
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Comments 1
Sep 27, 2018 05:43 AM
Thank u! i got the same answer as u do. the answer sheet must have been wrong as it states diameter of snall circle as 10cm.
September 27, 2018
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