To calculate this we just create a simple equation, where the total will be represented by x, so total will equal the remaining money + the spent money:
The formula for circumference is pi(diameter) or 2 x pi x radius. So you have the diameter which is 4.25. Next step you need to do is multiply it with pi which is equal to 3.14. Your equation would be C= 3.14 x 4.25.