212) 2:1
1) if A(1,-1,3) B(2,1,-2) C(-5,2,-6) are the vertices of a triangle ABC , then the length of internal angular bisctor of angle A is??
2)the median AD of triangle ABC is bisected at E and BE meets AC at F then AF:FC ???
3)if x and y are two non collinear vectors and tri ABC with sides a,b,c satisfying (20a-15b)x^ + (12c-20a)y^ + (12c-20a)(x^ x y^) = 0^ then trigle ABC is ?
anyone pls can help me atleast one f them
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