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Q:-midpoint of sides AB and AC of a triangle ABC are (3,5) and (-3,-3) respectively ,then the length of BC is

a)10 (b)20 (c)15 (d)30

5 years ago


Answers : (1)


Dear Rangavajjula,


A = x1,y1 , B= x2,y2 , c = x3,y3

3 = x1+x2/2 ,...1      5 = y1 + y2/2........2

-3 = x1 + x3 /2 .......3    , -3 = y1 + y3 /2........4

BC2 = (x3 - x2 )2 + (y3-y2)2

find x3 - x2 from eq 1 and 3,  y3-y2 from eq 2 and 4...





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Anil Pannikar

IIT Bombay

5 years ago

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