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Thursday, September 21 2017 @ 06:07 PM CDT
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 2013 P6 Prelims ! Maths ! SHHK Paper 2 Q5
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By: geniuskids (offline)  Wednesday, September 11 2013 @ 09:57 AM CDT (Read 1063 times)  
geniuskids

Hi, please explain why answer key is 60.

Pls refer to uploaded figure.

Thanks!

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By: echeewh (offline)  Wednesday, September 11 2013 @ 06:20 PM CDT  
echeewh

Hello <geniuskids>

If you examine the sides of that triangle ABC , all its 3 sides , AB, BC, CA are diagonals of each face of the cube. Hence these are of equal length. As such, the triangle forms an equilateral triangle with each interior angle of 60 degrees.

Trust this clarifies.

Cheers,
Edward

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By: geniuskids (offline)  Wednesday, September 11 2013 @ 10:41 PM CDT  
geniuskids

Thanks, got it..! Couldn't see that CB was diagonal initially. Laughing Out Loud

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