The straight lines x+y=0, 3x+y-4=0 and x...

The straight lines `x+y=0, 3x+y-4=0 and x+3y-4=0` form a triangle which is (A) isosceles (B) right angled (C) equilateral (D) scalene

A

isosceles

B

equilateral

C

right angled

D

none of these

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