Which of the following figures has the longest perimeter ?

Which of the following figures has the longest perimeter ? Correct Answer A circle of radius 7 cm

(a) Perimeter = (4 × 10) cm = 40 cm
(b) Perimeter = 2(12 + 9) cm = 42 cm
(c) Perimeter = $$\left( {2 \times \frac{{22}}{7} \times 7} \right)$$   cm = 44 cm
(d) Perimeter = (4 × 9) cm = 36 cm
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