If D,E,F be the middle points of the sides BC,CA and AB of the triangle ABC, then AD+BE+CF is
pallavi pradeep bhardwaj , 15 Years ago
Grade 12
Vectors> vector algebra-4...
1 AnswersRamesh V
Last Activity: 15 Years ago
let vectors a , b, c represent A,B,C respectively
so mid point vecors of D,E,F respectively are 1/2*(b+c) , 1/2*(a+c) , 1/2*(b+a)
AD+BE+CF = 1/2*(b+c) - a + 1/2*(a+c) -b + 1/2*(b+a) - c
AD+BE+CF = 0
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regards
Ramesh
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