Area and Circumference

3/18/2013

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The formula for finding the area of a circle is pi times the radius squared.  If you were given a circle and the only measurement you had was the radius, it would be enough to find the area.  Lets say you have a circle with a radius of 3 feet.  The first thing you have to is to square the radius, so you get 9 because 3 times 3 is 9.  Next you multiply 9 by pi (3.14).  9 times 3.14 is 28.26, so the area of a circle with a radius of 3 inches is 28.26 square inches.

If you know the radius of a circle you can also use it to find the circumference of it. The first thing you need to do is find the diameter, which of course is 2 times the radius, equaling 6 feet in this case since the radius is 3 feet.  Once you know what the diameter is all you have left to do is multiply it by Pi; so you would multiply 6 times 3.14 which equals 18.84 and that is the circumference. Now you should hopefully understand how to find the area and circumference of a circle.



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Steps of y=mx+b

3/11/2013

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Y=mx+b is a formula that you use to graph a linear function or just line.  The "m" represents the slope of the line, so if m=2 then you would start at the starting point and go up two, and over one.  The only problem is that you don't know where to start the line. You only know the slope.  That is what "b" is for.  "B" represents the starting point of the line, or the y-intercept, which is the point along the y-axis where the line crosses it.  If you know the value of "m" and "b" you can graph the line.


Step 1: Example equation y=2x+1
Step 2: Y-intercept is 1 so graph a point on (0,1)
Step 3: From (0,1) go up two, over one to find the next point (3,1)
Step 4: Keep adding points, then connect them to create the line


As you can see it is really very simple to create at graphed line when using y=mx+b!
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Pi

3/4/2013

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Well I did not really know a whole lot about pi until I did some research about it just now.  Pi really confuses me and makes my mind spin to think about because of the fact that it goes on forever, and literally has no end.  Because of the fact that Pi is irrational, it is impossible to express Pi as a ratio of two integers such as 22/7 or any other common fractions.  Pi is used to find the area and circumference of circles, but because Pi is irrational, it is impossible to square a circle.  This is really all I know about the number Pi.
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