• # question_answer Diagonal BD of the square ABCD is 31 cm. Radius of the circle with centre O is: A) 16.5 cm  B)                                16 cm C) 15.5 cm  D)       15 cm E) None of these

Explanation: Option (c) is correct. Diagonal BD = 31 cm, therefore, diameter of circle = 31 cm Hence, the radius of circle = ($31\div 2$) cm = 15.5 cm