SAT Math Multiple Choice Practice Question 141: Answer and Explanation
If a dart is thrown at the dartboard above, the probability that the dart lands in the square but not in the circle is closest to
Correct Answer: B
B. The area of the square is just 10 × 10 = 100. The area of the circle is πr2, which is π(5)2 = 25π, or about 78.5. So the probability that the dart lands in the square but not in the circle is , which is closest to 20%.