Plastic ratio
In mathematics, the plastic ratio is a geometrical proportion close to 53/40. Its true value is the real solution of the equation x3 = x + 1.
Triangles with sides in ratio ρ form a closed spiral | |
| Rationality | irrational algebraic |
|---|---|
| Symbol | ρ |
| Representations | |
| Decimal | 1.3247179572447460259609088... |
| Algebraic form | real root of x3 = x + 1 |
| Continued fraction (linear) | [1;3,12,1,1,3,2,3,2,4,2,141,80,...] not periodic infinite |
The adjective plastic does not refer to the artificial material, but to the formative and sculptural qualities of this ratio, as in plastic arts.
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