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

The straight line x+y=0, 3x+y-4=0 and x+3y-4=0 from a triangle which is

A

isosceles

B

right-angled

C

obtuse-angled

D

equilateral.

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The correct Answer is:

A, C

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