وابر ِ زرین vâbar-e zarrin
*Fr.: nombre d'or*
If a line segment is divided into a larger subsegment (*a*) and a smaller subsegment
(*b*), when the larger subsegment is related to the smaller exactly as the whole segment is
related to the larger segment, i.e. *a/b = (a + b)/a*. The golden ratio,
*a/b* is usually represented by the Greek letter φ. It
is also known as the *divine ratio*, the *golden mean*, the
→ *golden number*, and the *golden section*.
Its numerical value, given by the positive solution of the
equation φ^{2} - φ - 1 = 0, is
approximately 1.618033989. The golden ratio is closely related to the
→ *Fibonacci sequence*. → *golden*; → *ratio*. |