Yang examination
preferred label: آزمایش یانگ @fa
type: Concept
related: pi number

Plank formula
preferred label: فرمول پلانک @fa
type: Concept
related: pi number

Ghiyath al-Din Jamshid Kashani
preferred label: غیاث‌الدین جمشید کاشانی @fa
type: Concept
related: pi number

wavelength
preferred label: طول موج @fa
type: Concept
related: pi number

circumference
preferred label: طول دایره @fa
type: Concept
related: pi number

pi number
type: Concept
related: wavelength
related: Plank formula
related: circumference
related: Ghiyath al-Din Jamshid Kashani
related: Yang examination
preferred label: عدد پی @fa
broader: real number

real number
preferred label: عدد حقیقی @fa
type: Concept
narrower: pi number