Find the length x.
A) 11 cm
B) 44 cm
C) 22 cm
D) 80 cm
Correct Answer: C
Solution :
Perimeter of figure \[\text{A}=\text{2 (18}+x\text{) cm}\] Perimeter of figure \[\text{B}=(\text{4}\times \text{1}0+\text{2}\times \text{2}0)\text{ cm}\]= 80 cm Perimeter of figure \[\text{A}=(\text{2}\times \text{18}+\text{2 }\times \text{ }x\text{) cm}\] = 80 cm \[x=\frac{80-2\times 18}{2}=\frac{80-36}{2}\] \[x=\frac{44}{2}\text{ cm = 22 cm}\]
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