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What is a trick to remembering the formula for circumference and area of a circle?

Ok… lets make this easy. I want to know a trick to help me remember the formula for the circumference and area of a circle. The formula for circumference is C: 2 Pi r. (I’m really bad at memorizing things!) The formula for the area of a circle is A: Pi r squared. The squared is the little two. Whoever answers this first gets ten points! :)

I think if you get a tattoo of the formula on the back of your hand you’re golden.

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6 Responses to “What is a trick to remembering the formula for circumference and area of a circle?”

  1. C: Two Pies Are… (Insert ADJ.)
    A: Pies Are Squares…
    References :

  2. I think if you get a tattoo of the formula on the back of your hand you’re golden.
    References :

  3. A friend of mine told me a good one for remembering circumference:

    C=2pi(r) is also the same thing as C=pi(d) … d is diameter, which is the same as 2r
    So, she said "Cherry Pie is Delicious" for circumference.
    References :

  4. You can make Circumference into Pi D, where D is diameter, so that you can memorize only two things.

    Alternate way: Just memorize area: pi r squared. Then, for circumference, pull the 2 in front. You get the circumference formula.

    Alternate 2: In Area, the 2 is the exponent, in circumference, the 2 is the coefficient.
    References :

  5. thats simple.. stand in your front door, wallk 100 steps forward, jump 1.5 times, turn arround. go back 50 steps. lie down until a dog pees on you, stand walk 25 steps then crawl back to your house. go to ur kitchen and get a jug of milk, then drink half a gallon of water( water ok? not milk) then go to ur room and say c=2Pir and you will remeber all the things you will see for the next 40 days
    References :

  6. C = Pie R Squared.(C=Pi R2) , check out the formula, yours is wrong! A = Pie R Squared (A = Pi R2). Does that help. That’s how I remembered it.
    References :
    1951 Elementary 5th Grade Math Teacher..That’s been 58 years ago.

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