Homework Help: Pre-Calculus

Posted by Tyson on Friday, September 28, 2012 at 8:42pm.

Two sides of a triangle are x units and y units in length. The angle between them is theta. Prove that the area of the triangle is 1/2xysin(theta).

I'm not sure how to do this question, I tried drawing a picture but I'm still not understanding it.

Pre-Calculus - Reiny, Saturday, September 29, 2012 at 12:05am
draw a perpendicular from side x to side y, let it be h
Area of triangle
= (1/2)base x height
= (1/2) y h

but sinŲ = h/x
h = xsinŲ

so area =(1/2) y xsinŲ
= (1/2)xy sinŲ

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