When you have to recall your order of operations, you use Please Excuse My Dear Aunt Sally. I have created two memorable sayings that will help when you have to suddenly recall the formulas for the circumference and/or the area of circles. The saying for area is Auntie's Pies R at 2o'clock or A=piR^2 and circumference is Cooks have Two Pies Ready or C=2piR.
A=PiR^2 and C=2PiR Keep practicing. Be well.