Area, SM-Bank 152 If a circle has an area of 100 square millimetres, find the radius of the circle, giving your answer to 2 decimal places. (2 marks) --- 4 WORK AREA LINES (style=lined) --- Show Answers Only \(5.64\ \text{mm}\) Show Worked Solution \(A\) \(=\pi r^{2} \) \(100\) \(= \pi r^2\) \(r^{2}\) \(=\dfrac{100}{\pi}\) \(r\) \(=\sqrt{31.8309}\) \(=5.641…\) \(=5.64\ \text{mm (2 d.p.)}\)