Trigonometry help

a triangle of area 50cm^2 has side lengths 10cm and 22cm. what is the magnitude of the included angle?

I have no idea how to answer this, if there's anyone out there who could help me, I would gladly appreciate it.
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1 Answer

The area of a triangle is (1/2)bcsinA where b and c are sides and A is the included angle. (bsinA is the height and c is the base, or csinA is the height and b the base.)

So, 50=110sinA. sinA=50/110=5/11, so A=27.04° approx.

by Top Rated User (1.2m points)

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