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The Law of Sines with Proof. It states that the ratio of sides to…, by Wojciech Wieczorek
Using an obtuse triangle and half of the height to verify the formula.
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Visually prove area = 1/2 (base * height) for scalene triangle. - Mathematics Stack Exchange
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What is the area of an obtuse angled triangle given with two sides are 8 and 12 and the angle included between two sides is 150 degree? - Quora