A(-1,1),B(1,3),C(3,a)are theif points and if AB=BC,then find 'a'.
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given:
AB=BC
therefore B is in the middle of AC.
answer
B(1,3)={(-1+3)/2,(1+a)/2}
therefore,. 3=1+a/2
6=1+a
a=6-1
a=5
answer is 5
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