Riley, I've been thinking about calculus. {{CMD_7}} YOLO. {{CMD_8}} Consider a circle of some radius {{MATH_9}}. {{CMD_10}} Ha! What else would we ever call the ``radius?'' {{CMD_11}} Exactly. Now the formula for the perimeter of a circle is? {{CMD_12}} {{MATH_13}} baby. {{CMD_14}} And its area? {{CMD_15}} You know it's {{MATH_16}}. {{CMD_17}} Right, but here's what's bugging me: If I know {{MATH_18}}, what is {{MATH_19}}? What's {{MATH_20}}? {{CMD_21}} Oooh. Ouch. Hmmm. I wanna say it's {{MATH_22}} but I'm not sure that is right. {{CMD_23}} Yeah{{CMD_24}} me too. But I'm not sure that's right either. Are we forgetting something? {{CMD_25}} {{CMD_26}} Do you think our young mathematicians above are correct? {{CMD_27}} {{CMD_28}}Yes. {{MATH_29}} and {{MATH_30}}.{{CMD_31}} {{CMD_32}}No. While {{MATH_33}}, {{MATH_34}}.{{CMD_35}} {{CMD_36}}No. While {{MATH_37}}, {{MATH_38}}.{{CMD_39}} {{CMD_40}}No. {{MATH_41}} and {{MATH_42}}.{{CMD_43}} {{CMD_44}}There is no way to tell.{{CMD_45}} {{CMD_46}} {{CMD_47}}