Answer :

Given that,

In a parallelogram ABCD:


CD = AB = 16cm (Opposite sides of parallelogram are equal)


We know that,


Area of parallelogram = Base * Corresponding altitude


Area of parallelogram ABCD:


CD * AE = AD * CF


16 cm * 18 cm = AD * 10 cm


AD =


AD = 12.8 cm


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