4th Class Mathematics Area, Perimeter and Volume Question Bank Perimeter & Area

  • question_answer Figures A and B have the same perimeter.                         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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