The shaded square of the lattice shown has area 1.
What is the area of the circle through the points , and ?
Input note: give your answer as an exact value.
Select one option, then click Submit.
\frac{9\pi}{2}
8\pi
\frac{25\pi}{2}
25\pi
50\pi
Select an option, then submit.
Sign in or create an account to reveal answers, view the solution, and save your progress. Create a free account to unlock practice and keep track of your work.
Senior Mathematical Challenge 2008 (2008)
One puzzle per day. Cryptarithm, Magic Square, Summit. No sign-up required to play.
Play daily puzzle →Interactive problems and curated lessons—water pouring, magic squares, knight's tour, and more.
Browse library →See how you rank. Top solvers by problems solved correctly. Sign in to climb the ranks.
View leaderboard →Senior Mathematical Challenge 2008 (2008)