They make a pair of acute angles and a pair of obtuse angles. In rotational order, the angles are acute, obtuse, acute, obtuse.
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A perpendicular line is two lines that look like a plus +. If they're not perpendicular, they don't cross with 90 degree angles.
Yes. Take a look at the corner of your room, where two walls meet the floor.
whatto line segments intersect but are not perpendicular
bisectors
It is a perpendicular line (a vertical line) that divides the triangle into two equal parts.