SAT ? of the Day 10/7/08

Yesterday's answer:
Choice (D) is correct. It avoids the errors of the original by eliminating the extra subject, "each," and by avoiding subject-verb disagreement.

Question Type: Improving Sentences
(Writing)
Today's ?

Read the following SAT test question, then click on a button to select your answer.

Note: Figure not drawn to scale.

The circle shown above has center O and a radius of length 5. If the area of the shaded region is 20, what is the value of x?

1. 18


2. 36


3. 45


4. 54


5. 72

Hint
You can figure out the area of the whole circle, since you know that the radius is 5. From the area of the whole circle and the area of the shaded part, it is possible to find the measure of the angle that has its vertex at point O and is in the right triangle. Once you find that angle measure, you can find the value of x.