They are both closed figures
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They are both 4 sided quadrilaterals and have 4 interior angles that add up to 360 degrees
Triangles are not equal to each other in the same way that 5 = 5 or 23 = 8 + 15 because they are not discrete values. Congruent is a similar term to equivalent, which allows comparison.
They are both quadrilaterals.
Here is one way: /\ --- /\/\ ----- These are {45°, 45°, 90°} triangles. There are 3 on the bottom row, and 1 on top. Actually, any four identical isosceles triangles would work.
A quadrilateral with the same shape but all sides that are some (non-zero) multiple of the sides of the original. Another way of looking at it is two quadrilaterals whose corresponding angles are the same measure.