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a
isosceles and right angled
b
isosceles but not right angled
c
right angled but not isosceles
d
neither right angled nor isosceles
answer is A.
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Detailed Solution
Let ABC be the triangle with vertices A ( 4, 0), B (-1, -1) and C (3, 5). Then,AB=AC=26and BC=52Clearly, AB2+AC2=BC2Hence, the triangle is right-angled isosceles triangle