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Results on Quadrilaterals

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☼ Results on Quadrilaterals :

■ A parallelogram and a rectangle on the same base and between the same parallels are equal in area.

■ Of all the parallelogram of given sides, the parallelogram which is a rectangle has the greatest area.

■ Regular hexagon ( All the six sides are equal ) :

▪ Perimeter = 6 × side.

▪ Area = $\frac{3\sqrt3}{2}$ × ( side )².