Math Is Fun Forum

I think some of the data from the table is missing, or I'm not reading it right.

EDIT: Oh I see now.

The roots of the parabola must be -35 and 35 if the y axis is the axis of symetry.

b must equal Zero because the parabola is not shifted left or right. So that leaves us with the equation:

c is 185 because when an x value of 0 is subbed and a y value of 185 is subbed in c is denoted to be 185.

That leave us to find a.

Sub in 35, 0 zero for x and y values respectively and you will find a = -185/1225. Leaving us with the equation:

And it seems to work fin when I sub values in I havn't looked into simplifying it.

(Hurray I answered my first "Help Me!" on the forum )

Hmm, but I need to know PI in order to mirror the graph .... grrr.

Sounds like me if i was 11 years older, I have HSC next year and I better buckle down or I know I will really regret it.

These methods that involve creating more accurate representation of PI by increasing the number of time the SUM is repeated is impractical for calculating PI.

I've being looking at other methods, and there are algorithms that work by getting the n'th decimal of PI. Ie; Instead of increasing the accuracy each loop of the sum, it adds the next decimal place on.

Heres an example: http://fabrice.bellard.free.fr/pi/

I'm hoping to get the algorithm to work correctly in the computer program, then add functionality to check for redundancies and pattern. I'm not looking for the final repeating numbers and get the exact value of PI. I was thinking that perhaps there are patters. For example, any decimal place number which is a divisible of 'x' will always be 'y'.

An English lesson, that's infinity isn't it?

∞ = 1/0

Try to split 1 evenly between zero groups. That would be infinity. Atleast based on the elemntary school idea that divsion is giving an equal share of x to y amount of groups.

Unless theres another way find the side of a non-right angle triangle when given 2 sides and the angle between them, I don't know any way to get rid of cos. And a radian incorporates PI, wouldn't that make my formula infinitly long? Since 180 = PI Radians? Or is that only needed when converting radians and degrees.

I'm doing year 11 Extension 1 maths. I'm not sure what the equivilent is in america, but were covering interiro and exterior reatios of line intervals. We just finished 3d trigonometry (which was so easy, its just 2d trig with more than one triangle, I found it especially fun because everyone else found it difficult lol). I just started thinking, "I wonder how they figured out was PI was?" when I was supposed to be studying, so I spent the next hour devising this formula lol.

I'm going to make a console app in C++ to print the value of PI according to the formula for as many as possible, but I'll have to settle using 10^-999 until I can find infinity, I guess thats just for a later formula lol. (Anyone know how to grab the first decimal place of a number?)

By the way Admin, I love the quote in your sig, it's funny because it's true.

its not about transistors, its about charge in magnetic tape, there millions of seperate magnetic bits on a tape and the point either north or south, north being 0 south being 1. And its read by the computer.

How did you get to the c² - 2bc (cos θ) + b² (cos θ)² ?

if theres only one set of track incircling the town, how did they get one train to go one direction and one the other one. even if they were running at different times, if theres only one set of tracks then theres no where for the inactive train to wait.