The area of a circle is 154 cm2. Find the circumference of the circle. \(\left(\text{Take } \pi=\displaystyle\frac{22}{7}\right)\)
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 44 cm
The area \(\pi r^2\) gives the radius, and the radius gives the circumference \(2\pi r\).
Area: \(\displaystyle\frac{22}{7}\times r^2=154\)
Radius: \(r^2=\displaystyle154\times\frac{7}{22}=49\), so \(r=7\) cm
Circumference \(=2\times\displaystyle\frac{22}{7}\times7=44\) cm