AC Lim's answer to Darren's Secondary 1 Maths Singapore question.
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Hope this help
Date Posted:
4 years ago
How u get 5?
If you observe triangle ABD = Triangle BCD
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)
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)
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