Did you solve it? Are you a match for the dinkiest mag in maths?

Earlier today I posed four puzzles from the Hyde Park Math Zine, a maths fanzine from Austin, Texas. Here they are again with solutions. Ring it — Each region has a perimeter given by its enclosed number. What is the length just along the edge of the entire figure?

Solution 25. The length of the perimeter is the perimeters of the outer areas (12, 11, 5, 6, and 13) MINUS the perimeters of the adjacent areas (7, 3 and 16) PLUS the perimeter of the final area (4). 47 – 26 + 4 = 25. Or think of it from the inside out. The perimeter of the internal section with numbers 3, 4, 7 and 16 is 3 + 7 + 16 – 4 = 22.

P is the sum of perimeters of the outer areas, which is 47, minus the perimeter of the section with numbers 3, 4, 7 and 16. Thus P = 47 – 22. Eight ball — Place the digits 1 to 8 in the circles so that no digit is linked to an adjacent digit. Solution: This one is solved using “enlightened” trial and error.

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