Question

. In the diagram, the five circles have the same radii and touch each other as shown. The square joins the centres of the four outer circles. What is the ratio of the area of the shaded parts of all five circles to the area of the unshaded parts of all five circles?

Answer 1

The ratio of the area of the shaded parts of all five circles to the area of the unshaded parts of all five circles is 4:1.