law of sines and cosines, and areas of triangles
多边形面积(area_of_polygons)
以calculate the area of a triangle step 1为标题的图片
y=x1-图的是图下中的 d (y1 -1 1-1 xy1 ) (a )- 1 - 11 x (b)
the mid-points of the sides of the triangle whose vertices are
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