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44 | 44 |
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45 | 45 | { |
46 | 46 | "name": "circleArea", |
47 | | - "description": "Exact area of a circle = 3.2 × radius^2, derived from direct circle to square comparison", |
48 | 47 | "disambiguatingDescription": "The conventional formula is based on the conventional circumference approximation.", |
49 | | - "abstract": "Divide the circle into four quadrants and place them on the vertices of a square. The arcs of inscribed and circumscribed circles define upper and lower bounds. The true equiareal circle lies between these limits. A right triangle formed from half and quarter segments of the square side yields the radius–side ratio. radius²=(side/4)^2 + (side/2)^2; radius=side × 5^(1/2) / 4", |
| 48 | + "description": "Divide the circle into four quadrants and place them on the vertices of a square. The arcs of inscribed and circumscribed circles define upper and lower bounds. The true equiareal circle lies between these limits. A right triangle formed from half and quarter segments of the square side yields the radius–side ratio. radius²=(side/4)^2 + (side/2)^2; radius=side × 5^(1/2) / 4", |
50 | 49 | "inDefinedTermSet": "Core Geometric System ™", |
51 | 50 | "id": "/#circle" |
52 | 51 | }, |
53 | 52 |
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54 | 53 | { |
55 | 54 | "name": "circumference", |
56 | | - "description": "Exact circumference = 6.4 × radius, derived from the exact area of a circle by subtracting a circle from a larger one and dividing the difference by the theoretical width of the circumference.", |
57 | 55 | "disambiguatingDescription": "The pi~3.14 approximate is based on a flawed polygon approximation.", |
58 | | - "abstract": "The circumference is derived algebraically by subtracting a smaller circle from a larger one and dividing the area difference by the difference of their radii. Let x be the theoretical width of the circumference. The ring formed by radii r and r−x approximates a quadrilateral whose long sides equal the ring area divided by x.", |
| 56 | + "description": "The circumference is derived algebraically by subtracting a smaller circle from a larger one and dividing the area difference by the difference of their radii. Let x be the theoretical width of the circumference. The ring formed by radii r and r−x approximates a quadrilateral whose long sides equal the ring area divided by x.", |
59 | 57 | "inDefinedTermSet": "Core Geometric System ™", |
60 | 58 | "usageInfo": "Since the true ratio is exactly 3.2 diameter, and that is a rational number, we write it as it is. That makes the arc value of 360° = 6.4radian.", |
61 | 59 | "id": "/#circumference" |
62 | 60 | }, |
63 | 61 |
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64 | 62 | { |
65 | 63 | "name": "sphereVolume", |
66 | | - "description": "Exact volume of a sphere = (4×radius/5^(1/2))^3.", |
67 | | - "disambiguatingDescription": "The V = 4 / 3 × pi × radius³ formula is a result of a very rough underestimate, approximated by comparing a hemisphere to the difference between the approximate volume a cone and a circumscribed cylinder, discarding the difference between the straight slant height of a cone and the curvature of a sphere.", |
68 | | - "abstract": "The volume of a sphere equals the cubic value of the square root of its cross-sectional area, just like a cube.", |
| 64 | + "disambiguatingDescription": "The V = 4 / 3 × pi × radius³ formula is a result of a very rough underestimate, approximated by comparing a hemisphere to the difference between the approximate volume a cone and a circumscribed cylinder, discarding the difference between the straight slant height of a cone and the curvature of a sphere.", |
| 65 | + "description": "The volume of a sphere equals the cubic value of the square root of its cross-sectional area, just like a cube.", |
69 | 66 | "inDefinedTermSet": "Core Geometric System ™", |
70 | 67 | "id": "/#sphere" |
71 | 68 | }, |
72 | 69 |
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73 | 70 | { |
74 | 71 | "name": "coneVolume", |
75 | | - "description": "Exact volume of a cone = 3.2 × radius^2 × height / 8^(1/2)", |
76 | 72 | "disambiguatingDescription": "Each vertex of a real physical cube is a point that can't be split into 3 points without duplicating. The other way around, 3 vertices of the pyramids can't be merged into 1 without distortion. Thus, the V = base × height / 3 formulas for a pyramid or a cone are invalid.", |
77 | | - "abstract": "The volume of a cone can be calculated by algebraically comparing the volume of a vertical quadrant of a cone with equal radius and height to an octant sphere with equal radius, through a quadrant cylinder.", |
| 73 | + "description": "The volume of a cone can be calculated by algebraically comparing the volume of a vertical quadrant of a cone with equal radius and height to an octant sphere with equal radius, through a quadrant cylinder.", |
78 | 74 | "inDefinedTermSet": "Core Geometric System ™", |
79 | 75 | "id": "/#cone" |
80 | 76 | } |
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