A link between sectors and radius
Circles A and B have the same area and are overlapping. A vertical and straight line is drawn between the two points at which the circumferences of the circles intersect, and we shall call this line PQ. Another line is drawn between the points of each circle's circumference that reach deepest into the other circle and we shall call this line M. Line PQ has length 6cm, M has length 8cm and they are both perpendicular to each other. Find one of the circumferences of the circles (Round off answer to the nearest tenth).