SAT Subject Test Mathematics Level 1

(Marvins-Underground-K-12) #1

The shaded region is what’s left of the 120° sector after you subtract the
triangle with the 120° vertex angle.


To find the area of the shaded region, find the areas of the sector and triangle,
then subtract. The sector is exactly one-third of the circle (because 120° is
one-third of 360°), so


You can divide the triangle into two 30-60-90s:

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