SAT Math Multiple Choice Practice Question 495: Answer and Explanation
15. What is the greatest number of regions into which an equilateral triangle can be divided using exactly three straight lines?
Correct Answer: C
C The Joe Bloggs answer is E because Joe simply chooses the greatest number. If you draw three straight, intersecting lines through the center of the triangle, you get 6 regions, so you know that you can have at least 6. Therefore, you can eliminate A. But that was too easy. That means the answer must be 7 or 8. If you don't have time, you can guess between C and D. Here's how you can actually get 7 regions: