Question

The perimeter of parallelogram ABCD is 22 cm. If AB = 4 cm, then BC = ____ cm.
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Answer 1

Answer:

BC= 7 cm

1. ABCD is a parallelogram which means that its opposite sides are equal
2. that means AB=Cd=4 cm
3. perimeter =22cm,also perineter =2(l+b)
4. taking l =4 and b=x
5. 22= 2(4+x)
6. 22=8+2x
7. 22-8=2x
8. 14=2x
9. x=7 (x=b)
10. hence b =7cm , BC =7cm