Math Is Fun Forum

StrollingBy

Member

Registered: 2012-01-03

Posts: 5

Pie

Would you explain to me just - step by step -  how I convert Si(3pie) into a decimal?
   Thank you.

Onward and upward.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Pie

Hi StrollingBy;

Is this what you mean?

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

StrollingBy

Member

Registered: 2012-01-03

Posts: 5

Re: Pie

Yep...that's what I mean. By the way, how do you produce the mathematical sign on Windows for pi? I await your reply with patience.

Bob

Administrator

Registered: 2010-06-20

Posts: 10,143

Re: Pie

hi StrollingBy

Welcome to the forum! 

Your second question, first.

You can create mathematical expressions by using a computing language called LaTex.

Have a look at http://www.mathisfunforum.com/viewtopic.php?id=4397

The LaTex for a pi symbol is \pi

If someone has used LaTex in a post you can view their code by clicking on their LaTex.  The starting square bracket and the closing square bracket are not shown in these circumstances.

Now to the sine function.

Sine is periodic (repeats the same values) with period 2pi so

MIF has made a really good page, introducing the sine function at

http://www.mathsisfun.com/algebra/trig- … rants.html

This is all laid out in degrees.  But mathematicians often use radians rather than degrees for certain problems involving angular measures.

Why?  Well that's another post entirely.  It may be enough to know that

Also well worth a look is

http://www.mathsisfun.com/algebra/trigonometry.html

Scroll down for a couple of really helpful interactive elements.

Bob

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Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob