The perimeter of ABCD Ilgm is 40 cm and AB = 12 cm then AD
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ABCD = AB + BC + CD + AD
In parallogram opposite sides are equal AB = CD , BC=AD
ABCD = AB + AB + AD + AD
ABCD = 2AB+ 2AD
40= 2(12) +2AD
2AD =40- 24
2AD = 16
AD = 8cm
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