Chalkdust issue 11 puzzle hunt #2

TD Dang sets the second puzzle. Can you solve it?


The day is finally here: issue 11 is out now! To help you celebrate launch day in style, we’ve set a puzzle hunt: throughout the day, we are posting a series of puzzles. The answers to these puzzles form clues to the code for the door to let you into the Chalkdust issue 11 secret backstage lounge.

The second puzzle is set by TD Dang. You can see the puzzle below, or download it as a pdf.

Be sure to come back at 1pm when the third puzzle will be posted.

TD’s puzzle

The three circles below all meet at tangents. The area of the largest circle is $20\pi$.

The sum of the first and last digits of the code is less than the area of the blue quadrilateral.

TD is an undergraduate at UCL who actually understands the 1967 James Bond spoof Casino Royale, starring David Niven, Peter Sellers, Woody Allen, and Orson Welles as Le Chiffre.

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