Subject: General Aptitude · Chapter: Area · Exam: · Marks: · Difficulty:
The diameter of a circle is equal to the perimeter of a square whose area is $3136 \mathrm{cm}^{2}$. What is the circumference of the circle? [IBPS-RRB Office Assistant (Online) Exam, 2015]
(a)352 cm
(b)704 cm
(c)39424 cm
(d)1024 cm
Answer
Answer (as printed): B
Explanation
Area of square $=3136 \mathrm{cm}^{2}$ Side of squared $=\sqrt{3136}=56 \mathrm{cm}$ Perimeter of square $=4 a$ $$=(4 \times 56) \mathrm{cm}=224 \mathrm{cm}=\text { Diameter of circle }$$ ∴ Circumference of circle $=\pi d$ $$\frac{22}{7} \times 224=704 \mathrm{cm}$$