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Take identical cut-outs of congruent tri...

Take identical cut-outs of congruent triangles sides 3 cm, 4 cm, 5 cm. Arrange them as shown in figure .

Yoti get a trapezium. (Check it !) Which are the parallel sides here? Should the non-parallel sides be equal?
You can get two more trapeziums using the same set of triangles. Find them out and discuss their shapes.

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