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9.Straight Line
normal
$ABC$ is an isosceles triangle . If the co-ordinates of the base are $(1, 3)$ and $(- 2, 7) $, then co-ordinates of vertex $A$ can be :
A
$\left( { - \,{\textstyle{1 \over 2}}\,\,,\,\,5} \right)$
B
$\left( { - \,{\textstyle{1 \over 8}}\,\,,\,\,5} \right)$
C
$\left( {{\textstyle{5 \over 6}}\,\,,\,\, - \,5} \right)$
D
$\left( { - \,7\,\,,\,\,{\textstyle{1 \over 8}}} \right)$
Solution
Vertex will satisfy the equation of the perpendicular bisectors except the middle point .
Standard 11
Mathematics