law of sines and cosines, and areas of triangles
1 area of triangle 1 area = ah h in acd = = sin c b ∴ h
b/c=1/2 =sin 3002=cos 6002a/c=√3/2 =sin 6002=
看下面的图形: s△abc=1/2ab*ac*sinα,s△aeg=1/2ab*ac*sinβ,而α
in the jeftlik area of the foot prints of the faria basin, in
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