There the most aerodynamic of fin shapes.
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in math we learned about a parelleogram.
parallelogram hope i help you :) Well, I think it is a parallelogram, square, rhombus. That is all I know :P
I can use it when lines are joined together
If they are congruent right angle triangles then just join them together side by side to form a parallelogram.
No, a trapezoid is not a parallelogram.