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If the perimeter of the quadrilateral ABCD is 18 cm. Find AD

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16 cm

12 cm

14 cm

6 cm

answer is D.

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Detailed Solution

Perimeter of the quadrilateral = Sum of all the sides
18 cm = AB + BC + CD + DA
18 = AD + 3.5 + 4.5 + 4

18 = AD + 12
AD = 18 - 12
AD = 6 cm

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