Re: really easy trig question


"." <.@.com> wrote in message
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>
> <matt271829-news@xxxxxxxxxxx> wrote in message
> news:1125486982.505779.162180@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>>
>> . wrote:
>>> Hi All,
>>>
>>> I used to know this, but my brain has got rusty with age.
>>>
>>> Why is it that sin (Pi/3) = (root 3)/2 ?
>>>
>>> Thanks for your help
>>>
>>> Michael
>>
>> Draw an equilateral triangle, and drop a perpendicular from the apex to
>> the base. Then a bit of Pythagoras and you should be done.
>>
>
> Sorry, I must have worded my question badly.
>
> If I do as you have said for a unit equalateral triangle I get ~0.866 , which
> ~(root 3)/2
> But if I didn't know 0.866 ~(root 3)/2, how would I come up with the idea of
> trying (root 3)/2 ?

He, said "a bit of Pythagoras", not "use a calculator"


.

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