14. The diagram shows five circles of the same radius touching each other. A square is drawn so that its vertices are at the centres of the four outer circles.
What is the ratio of the area of the shaded parts of the circles to the area of the unshaded parts of the circles?
A $1: 3$
B $1: 4$
C 2:5
D $2: 3$
E $5: 4$
14. D The shaded area is equal to that of 1 circle $+4 \times \frac{1}{4}$ circles $=2$ circles. The area of the unshaded parts of the circles is equal to that of $4 \times \frac{3}{4}$ circles $=3$ circles. Hence the required ratio is $2: 3$.