1.

If the vertices of a triangle are A(1,4,2), B(-2,1,2),C(2,3,-4) then find /_A,/_B,/_C.

Answer»


Answer :`lfloorA=(PI)/(2),lfloorB=cos^(-1)((3)/(2sqrt(7))),lfloorC=cos^(-1)sqrt((19)/(28))`


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