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formula for height of triangle

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by blaster » Fri Dec 19, 2008 9:30 am
exercuse me for this stupid question,i really forgat the formula for height.
for example, we have triangle with angles 90,60 30. and i now the lenght each of the side. how can i find height of this triangle.
or how can i calculate the area of triangle without using height of triangle.
thank you beforehand.
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Re: formula for height of triangle

by logitech » Fri Dec 19, 2008 9:49 am
logitech wrote:for 30,60,90 triangle the sides are:

X, 2X and XSQRT(3)

Lets say X=1

1, 2, and sqrt(3)

The area of the triangle is : 1x qrt(3) / 2

Now you should remember that every triangle has 3 heights

So

1 x h1/2 = qrt(3) / 2 ---h1 = qrt(3)

2 x h2/2 = qrt(3) / 2 ---h2 = qrt(3) / 2

sqrt(3) x h3/2 = sqrt(3)/2 ---h3 = 1

TATAMM!! :wink:
LGTCH
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