I had the following brainstorm at an embarrassingly advanced age:Tell your kids.
For a long time, I knew there were two formulas that were somehow relevant to circles, namely 2
πr and πr2, but I could never remember which one was area and which one was circumference.
I finally realized that πr2 must be the formula for area, because area is described in square units.
Monday, March 28, 2011
how to remember
FedUpMom on remembering area vs circumference: