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| | Pi - Wikipedia, the free encyclopedia |
 | | The 9 points (-1,-1), (-1,0), (-1,1), (0,-1), (0,0), (0,1), (1,-1), (1,0), (1,1) are found to be inside the circle, so the approximate area is 9, and π is calculated to be approximately 2.25. |
 | | Because the coordinates of all points that can be constructed with compass and straightedge are constructible numbers, it is impossible to square the circle: that is, it is impossible to construct, using compass and straightedge alone, a square whose area is equal to the area of a given circle. |
 | | Another approximation of π is to throw points randomly into a quarter of a circle with radius 1 that is inscribed in a square of length 1. |
| en.wikipedia.org /wiki/Pi (4643 words) |
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