Area of Trapezium (Proof using Parallelogram)

Q1. In the activity above, how many trapeziums is used to form a parallelogram?
Q2. What is the area of the trapezium if the area of the parallelogram is 100 cm[sup]2 [/sup] ?
Q3. The above activity shows how two identical trapeziums can be arranged to form a parallelogram.[br]Can you think of any other examples where two identical shapes are used to form another shape?
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Information: Area of Trapezium (Proof using Parallelogram)