I know that the formula is A = Pi R*2, but what is the significance of pi? How does it help us with area. Why?
Thanks!
2006-09-06 15:00:42 · 6 answers · asked by Espressologie 2 in Science & Mathematics ➔ Mathematics
Pi is a "transcendental" number equal to around 3.1415, or 22/7. Its value has been known for at least 2,500 years by the ancient civilizations. Its significance is that it is the number by which you must multiply the square of the radius of a circle to get the area.
2006-09-06 15:04:30 · answer #1 · answered by ? 6 · 1⤊ 0⤋
I wished someone had taught me this when I was starting algebra -- fractions, decimals and ratios can be visualized as three columns of figures BUT in each row we can express the same value for each row of those figures in the three columns.
That is to say, pi is a ratio which is the most useful representation of the value of the size of the area of a circle. The ancient Greeks had nothing but a compass trying to prove their geometric theorems. They came close to our approximation of pi as for every seven steps a line makes counterclockwise it will fall 22 steps.
2006-09-06 15:12:46 · answer #2 · answered by Anonymous · 0⤊ 0⤋
By definition, The circumference of the circle is 2*pi*r.
The area can be derived from this, but it is a bit hard to explain how, if you don't know about integrals. I believe you will learn about this in 11th grade or something like that.
2006-09-06 15:43:01 · answer #3 · answered by Anonymous · 0⤊ 0⤋
correction.
Area= Pi * R * R
2006-09-06 16:24:02 · answer #4 · answered by Prince 1 · 0⤊ 0⤋
Pi is one of those universal constants that just "is". Itself is defined by its relationship in the area of the circle.
There are many universal constants that are clearly demonstratable, but the numbers themselves as constants simply have to be accepted.
2006-09-06 15:10:40 · answer #5 · answered by Cabhammer 3 · 0⤊ 0⤋
Here ya go...
2006-09-06 15:05:51 · answer #6 · answered by Savage 3 · 0⤊ 0⤋