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They will form a 4 sided quadrilateral if the triangles are the same sizes.
Absolutely. Any two congruent right triangles will form a rectangle, and if the right triangles are isosceles right triangles, they will form a square.
A pair of triangles can form a 4 sided quadrilateral
Triangles do not have parallel lines but as right angles triangles they do have perpendicular lines that meet at 90 degrees.
Use three sticks to form a triangle. Use the other three sticks to form an inverted triangle and place it on top of the first. You will have two large triangles and six small ones - eight triangles in all. The shape is also known as the Star of David.