Can you solve it? Pi Day puzzles that will leave you pie-eyed

Two teasers - one gyral and one viral - to usher in the annual celebration of maths

UPDATE: You can read the solutions and poll results here.

Hi guzzlers.

Tomorrow is Pi Day - March 14 - the annual excuse for the mathematical community to circulate puns about buns. I mean to honour pi, the ratio of a circle's circumference to its diameter, which to two decimal places is 3.14, hence 3/14, as the Americans write tomorrow's date.