the diameter of a circle is 3.5cm. find its circumference and area with steps. (take pie=22 by 7) Share with your friends Share 3 Varun.Rawat answered this We have,diameter of circle = 3.5 cmradius = diameter2 = 3.52 = 74 cmperimeter = 2πr = 2×227×74 = 11 cmarea = πr2 = 227×742 = 778 = 9.625 cm2 3 View Full Answer