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Saturday, September 23 2017 @ 11:25 AM CDT
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 Raffles girls PRE 2010
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By: sundarshoba (offline)  Sunday, July 08 2012 @ 05:46 PM CDT (Read 817 times)  
sundarshoba

Please help to check the question 15 as attached, thank you very much

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By: echeewh (offline)  Sunday, July 08 2012 @ 11:50 PM CDT  
echeewh

Hey Sundar,

Answer is (b) 62.8 cm.

Here's how .....

Join centre O to top edge of circle where the right angle is. This makes it the radius of the circle.

Hence, 1/2 the given triangle = 50 cm2.

Area of this half triangle = (r x r) / 2 = 50
r x r = 100
r = 10 cm

Circumference of circle = 2 x pi x r = 20 x 3.14
= 62.8 cm

=============

Trust this helps.

Cheers,
Edward

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