Find The Area Of A Circle Online zombie Game - math game for 1st, 2nd, 3rd, 4th, 5th, 6th grades. Learn how to find the area of a circle using the formula commonly used. In it, students are required to multiply pie by the radius squared. This game contains over 12 questions which students have to solve correctly. It is best to have 100% in this game since it increases your chances of getting to the final destination safely. To get to this final spot, you should avoid the zombies. You may not be always lucky since some times the dice lands you on the bad spot. This game is free and online hence access is 24/7. Please play and share.