The 3 interior angles of any triangle always add up to 180 degrees
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No because the 2 angles do not add up to 90 degrees
a triangle has 0 lines of symmetry.
No such thing as a four-sided triangle !
The internal angles of a triangle add up to 180 degrees so in an equilateral triangel each internal angle must be 60 degrees, as 3 x 60 = 180.