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Math Home Search Dr. Why not solve for pi?
I am a year-old homeschooler and I cannot understand why it is not important to always solve an equation that contains pi to the full number. For example, the area of a circular cylinder is to be found. The correct answer is square meters, not pi square meters.
I ALWAYS use pi immediately in the first step, calculate, and take the larger number all the way through the entire problem when my teacher insists that it isn't necessary.
She says that it is ok to write it as pi square meters, but that isn't finishing the problem! In real life, of course, you would want an actual number, which you would then use to buy your paint or whatever. In class, a teacher likes you to leave the answer in terms of pi, because it's easier to check: And she knows you can do the last step of multiplying; all the important part of the problem has been done, so why waste your or her time?
To a mathematician, the answer in terms of pi is nicer, because it is exact--there's no rounding involved. There's something else that ties all these viewpoints together: In your example, by replacing pi with its value evidently 3.
If there had been a lot more arithmetic following that, each step might have brought in more inaccuracy called "rounding error".
Furthermore, by using 3. If you had left it for later, at the end you could have used a more accurate value and obtained a more precise answer: And you would not have had to carry around lots of decimal places in your work in order to get this precision: That will satisfy everyone, including you when you need an exact value and can get it with less chance of error.
If you have any further questions, feel free to write back. Thank you Why not solve for pi? Thank you for helping me with my math problem. It answered all of my questions.How to Write a Promissory Note. In this Article: Article Summary Sample Promissory Notes Writing Your Own Promissory Note Ensuring the Note is Enforceable Collecting on an Unpaid Note Community Q&A A promissory note is a written agreement to repay a debt.
Sometimes referred to as a note, this document is legally enforceable. Mathematics Stack Exchange is a question and answer site for people studying math at any level and professionals in related fields.
Join them; it only takes a minute. How to Write a Promissory Note. In this Article: Article Summary Sample Promissory Notes Writing Your Own Promissory Note Ensuring the Note is Enforceable Collecting on an Unpaid Note Community Q&A A promissory note is a written agreement to repay a debt.
Sometimes referred to as a note, this document is legally enforceable.
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Note: When this method is not used for testing, it is often used to write some text to. How to Type the Pi Symbol.
Typing π on your keyboard can be almost as challenging as using π in an equation. But typing the π symbol isn't as hard as it seems, whether you have a Mac or a PC. If you want to know how to type π in a few sec.