John builds a square with a side of 12 cm from some wire. If from the same wire, he builds a rectangle with a width of 6 cm, what will be the length of the rectangle? Answers.
A) 18 cm
B) 19 cm
C) 20 cm
D) 21 cm
E) None
Solution:   If the side of the square is 12 cm, then its perimetre will be 48 cm. We build the rectangle from the same wire, so it will have the same perimetre. Its width is 6 cm, so its length will be (48-12) ÷ 2 = 36 ÷ 2 = 18 cm   18 cmnswer 18 cm
<result>A</result>
John builds a square with a side of 12 cm from some wire. If from the same wire, he builds a rectangle with a width of 6 cm, what will be the length of the rectangle?