SAT Subject Test Mathematics Level 1

(Marvins-Underground-K-12) #1
Figure  5

Once again, the key here is to add to the figure. And in this case, as so often
when there’s a circle, what you should add is radii. The equilateral triangles
tell you that the central angles are 60° and 120°.


In  Figure  5,  rectangle   ABCD    is  inscribed   in  a   circle. If  the radius  of  the
circle is 1 and AB = 1, what is the area of the shaded region?

1.


(A) 0.091


(B) 0.285


(C) 0.614


(D) 0.705


(E) 0.732

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