# What is a quadrilateral shape?

A quadrilateral is any polygon with

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A quadrilateral shape is a polygon with four sides and four angles.

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- Two opposite sides of a parallelogram each have a length of #10 #. If one corner of the parallelogram has an angle of #(3 pi)/4 # and the parallelogram's area is #70 #, how long are the other two sides?
- How do you calculate the area of a parallelogram if only two diagonals are given?
- Two rhombuses have sides with lengths of #9 #. If one rhombus has a corner with an angle of #pi/12 # and the other has a corner with an angle of #(5pi)/12 #, what is the difference between the areas of the rhombuses?
- A parallelogram has sides A, B, C, and D. Sides A and B have a length of #18 # and sides C and D have a length of # 9 #. If the angle between sides A and C is #pi/4 #, what is the area of the parallelogram?
- Two rhombuses have sides with lengths of #3 #. If one rhombus has a corner with an angle of #(7pi)/12 # and the other has a corner with an angle of #(pi)/6 #, what is the difference between the areas of the rhombuses?

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