law of sines and cosines, and areas of triangles
a2=b2 c2, 解得:a2=3,b2=1,c2=1, ;-----------------(4分) 设c(x1,y1
a triangle-shaped area of land made from soil deposited by a
以calculate the area of a triangle step 1为标题的图片
the mid-points of the sides of the triangle whose vertices are
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