a triangle is formed by line segments that connect two non-collinear points
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Any three angles that sum to 180 can form a triangle.
Three equal sides in the form of an equilateral triangle and two equal sides in the form of an isosceles triangle
False: A triangle will only tessellate if it's in the form of an equilateral triangle.
No
Two lines can't do that. It takes three lines to form a triangle.