Happy Pi Day! Lets's celebrate the amazing relationship between the circumference and diameter of circles using some fruit from the fridge. A great way to get kids thinking, learning and doing hands on Math at home. This lesson can be modified for Pre-K through High School through how much helping parents are doing. What is Pi, besides one of the best desserts you can make with fresh picked Hudson Valley Apples? Pi is the ratio between the circumference and diameter of circle