A) Equilateral triangle = 9 cm; Square = 12cm
B) Equilateral triangle = 12 cm; Square = 9 cm
C) C. Equilateral triangle =15 cm; Square = 10cm
D) D. Equilateral triangle = 6 cm; Square = 4 cm
Correct Answer: B
Solution :
We find perimeter of equilateral triangle and square in all cases (a) Perimeter of eq. \[\Delta =9\times 3=27\,cm\] Perimeter of square \[=12\times 4\,=48\,cm\] (b) Perimeter of eq. \[\Delta =12\times 3=36\,cm\] Perimeter of square = 9 x 4 = 36 cm (c) Perimeter of eq. \[\Delta =15\times 3=45\,cm\] Perimeter of square = 10 x 4 = 40 cm (d) Perimeter of eq. \[\Delta =6\times 3=18\,cm\] Perimeter of square = 4 x 4 = 16 cm Thus we see that perimeter of eq. A and square are equal in (2)
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