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Junior high school mathematics: verify that the area of a triangle is equal to half the product of the sine value of the angle between the two sides.
Very simple ~? As shown in the figure, the values of AB and BC in triangle ABC, namely angle B, are known.
Make AD perpendicular to BC
The area of the triangle ABC =0.5*BC*AD.
Where: ad = ab * sin < B
That is, the area of triangle ABC = 0.5 * AB * BC * SIN < B.