SAT Subject Test Mathematics Level 1

50 .

Figure  10

In  Figure  10, each    of  the three   circles is  tangent to  the other   two,    and

each    side

of  the equilateral triangle    is  tangent to  two of  the circles.    If  the length

of  one side    of  the triangle    is  x,  what    is  the radius, in  terms   of  x,  of  one

of  the circles?

(A)

(B)

(C)

(D)

(E)