题目信息
In the diagram above, angle C = 90º and AC = BC. Point M is the midpoint of AB. Arc AXB has its center at C, and passes through A and B. Arc AYB has its center at M and passes through A and B. The shaded region between the two arcs is called a "lune." What is the ratio of the area of the lune to the area of triangle ABC?
A:1
B:$$\frac{\pi}{2}$$
C:$$\frac{\pi}{3}$$
D:$$\frac{3\pi}{8}$$
E:$$\frac{4\pi}{9}$$
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A:1
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