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How can I find the height of a scalene triangle given its side angles, 6, 8, and 10?

 Apr 14, 2014
 #1
avatar+130478 
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How can I find the height of a scalene triangle given its side angles, 6, 8, and 10?

You don't have a scalene triangle, you have a right triangle. If its hypoteneuse (the side with the measure of 10) isn't the base, then it's height is either 6 or 8, depending on the orientation of the triangle.

If the hypoteneuse is the base, it's a little more difficult. Let us orient the triangle so that the hypoteneuse is the base and the side with the length of 8 is on the "left" side of the triangle. Using the law of sines, we can find the sine of the angle that lies between the side with length 8 and the hypoteneuse. We can just label this angle as "A."

sin 90 / 10 = sin A / 6    which gives us

sin A = 6 /10= .6

Now, draw a perpendicular from the base to the apex ....this is the height (h)

And using the law of sines again (and realizing that the perpendicular forms a right angle), we have

h / sin A = 8 / sin 90

h / .6 = 8

h = 8(.6)  = 4.8

That one was a little tougher !!!

 Apr 15, 2014
 #2
avatar+118706 
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How can I find the height of a scalene triangle given its side angles, 6, 8, and 10?

Chris was right when he said that this is a right angled triangle but it is ALSO A SCALENE TRIANGLE.

So you can use 6 as the base and 8 as the height

or

you can use 8 as the base and 6 as the height.

or

you can use 10 as the base and do all that working that Chris did to get the height.

 Apr 15, 2014

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