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Question

Construct a quadrilateral ABCD in which AB = BC = 6 cm, AD = DC = 4.5 cm and ∠B = 120°.

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Solution

Steps of construction:Step I: Draw AB=6 cm.Step II: Construct ABC=120°.Step III : With B as the centre and radius 6 cm, cut off BC=6 cm.Now, we can see that AC is about 10.3 cm which is greater than AD+CD=4.5+4.5=9 cm.We know that sum of the lengths of two sides of triangle is always greater than the third side but here, the sum of AD and CD is less than AC.So, construction of the given quadrilateral is not possible.

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