luisz
what is the perimeter of triangle ABC?



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pitankar
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sum of the three side's length.

luisz
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dw:1347812022332:dw

luisz
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tips?

hartnn
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there is a 306090 triangle, u know the property of this special triangle ??

luisz
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yes

luisz
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but I know none of the sides

luisz
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And I do not know the angles for the other triangle with sides

luisz
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I could assume that triangle ABC is a 306090, right?

luisz
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C=30 degrees

luisz
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A=60 degrees

luisz
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B=90 degrees?

pitankar
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calculate the length of perpendicular from A to BC using Pythagoras theorem. then use trigonometry relations to calculate AC. rest you can get...

hartnn
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use pythagoras theorem to find the side...\dw:1347812215548:dw

luisz
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ahh

luisz
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good ol' pythagorean theorem

luisz
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so we have a 91215 right triangle

luisz
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345?

luisz
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so the altitude becomes 12

hartnn
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now AD = 12
can u find all sides ?

luisz
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30 degree side becomes 12 radical 3

luisz
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AC equals 24

luisz
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now

luisz
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15+24=39

hartnn
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use pythagoras

luisz
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39+9=48

luisz
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48+12 radical 3?

luisz
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is that really it?

luisz
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No wonder this problem was so hard

luisz
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I never used pythagorean theorem

luisz
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derp

hartnn
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u did this by yourself :)

chihiroasleaf
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you have lots of geometry problem @luisz :p

luisz
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ty

luisz
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I know