### AC Lim's answer to Darren's Secondary 1 Maths Singapore question.

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Hope this help

Date Posted:
1 month ago

How u get 5?

and are equilateral triangle, Each have 60 deg. Therefore, height of BCD meet at center of DC. DC/2=5cm.

Another way to get height = 10 cos 30

or

10 Sin 60 (Since each angle are 60)