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 Forum Index >  Test Paper Related >  Primary 6 Matters
 Rosyth preliminary 2011 paper 1 qtn 11
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By: richardli (offline)  Sunday, July 01 2012 @ 12:39 AM CDT (Read 1244 times)  

Pls help, why the answer is 1/3 and not 2/5?

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By: GIM (offline)  Sunday, July 01 2012 @ 02:58 AM CDT  

A hexagon can make 6 small triangles from the base of each sides to the centre. Then each small trianle is 1/6 fraction of the hexagon.
When you take 1 of the small triangle and extend the height to what is shown in the figure, then the area will be twice that of 1/6 which is 1/3.

Area of 1 small triangle = 1/2 x base x h1 = 1/6
when height is twice h1, area = 1/2 x base x (h1 x 2) = 1/6 x 2 = 1/3

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By: echeewh (offline)  Sunday, July 01 2012 @ 05:56 AM CDT  

Hey there,

Kindly refer to attached diagram for ALTERNATIVE solution.

Trust this helps.


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