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April 18, 2015

April 18, 2015

Posted by **hazel** on Saturday, November 23, 2013 at 10:19am.

- math -
**Reiny**, Saturday, November 23, 2013 at 12:50pmA very common formula for the area of a triangle with sides A and B with Ø the contained or included angle between them is

Area = (1/2)(A)(B)sinØ

then

(1/2)(12)(9)sinØ = 48

sinØ = .88888..

Ø = appr 62.7° or 117.3°

make a sketch to see why this is so.

remember:

sinx = sin(180°-x)

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