A straight triangle cannot exist.
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A triangle. An equalateral triangle
A triangle is a 3 sided closed shaped polygon
A quadrilateral triangle is an impossible shape. A quadrilateral has four straight sides while a triangle has three.
No. It's not possible to start at one vertex of the triangle and proceed to the midpoint of the opposite side, by way of a straight path that takes you outside of the triangle.
It will be an obtuse or an isosceles triangle which would look like a straight line