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# pi

noun (pi; the Greek letter π)

«pi» in the English dictionary: everyday and in Jewish tradition — its meanings, how the lessons use it, and examples, each with its tree on Mova.

## Everyday

1. Pi is a special number, about 3.14, that links the distance around a circle to the distance across it. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/P/pi/#m1)
2. Pi (π) is also a letter of the Greek alphabet. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/P/pi/#m2)
3. Pi can also be a shrill, high sound, like the noise of a pipe. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/P/pi/#m3)

### In the lessons

In maths: used with circles: circumference and area; π ≈ 3.14 or 22/7; its digits go on forever without repeating. In science: used to work out wheels, planets' orbits and round things. In everyday life: «Pi Day» fun in schools; people try to remember many digits of pi.

### Examples

- Use 3.14 for pi. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/P/pi/#x1)
- The circumference is pi times the diameter. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/P/pi/#x2)
- Area of a circle is pi times the radius times the radius. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/P/pi/#x3)
- The symbol for pi is π. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/P/pi/#x4)
- The digits of pi go on forever: 3.14159… [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/P/pi/#x5)
- A wheel 1 meter across moves about 3.14 meters in one turn. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/P/pi/#x6)
- Some people can remember a hundred digits of pi. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/P/pi/#x7)
- Our class ate pie on Pi Day. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/P/pi/#x8)
- On he ran, and louder grew the sounds of pipe and drum: pi-pi-pi, pi-pi-pi, pi-pi-pi . . .zum, zum, zum, zum. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/P/pi/#x9)

### Note

Pi ≈ 3.14 or 22/7. Circumference = pi × diameter; area = pi × radius × radius. Trap: do not mix radius and diameter (diameter = 2 × radius). Homophone: pie (food); the joke «pi» and «pie» is common. Pi is the same for every circle, big or small.

## In Jewish tradition

Pi-hahiroth is where the Israelites camped just before the sea split. Pi-beseth is an Egyptian city whose young men Ezekiel says will fall by the sword.

**Interpretation.** The rabbis said God led them to Pi-hahiroth on purpose, so Pharaoh would think they were trapped and follow them to the sea.

### Examples

- 'Speak unto the children of Israel, that they turn back and encamp before Pi-hahiroth, between Migdol and the sea, before Baal-zephon, over against it shall ye encamp by the sea. (Torah EXO.14.2, JPS 1917) [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/judaism/P/pi/#x1)
- And the Egyptians pursued after them, all the horses and chariots of Pharaoh, and his horsemen, and his army, and overtook them encamping by the sea, beside Pi-hahiroth, in front of Baal-zephon. (Torah EXO.14.9, JPS 1917) [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/judaism/P/pi/#x2)
- The young men of Aven and of Pi-beseth shall fall by the sword; and these cities shall go into captivity. (Prophets EZK.30.17, JPS 1917) [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/judaism/P/pi/#x3)

### Note

Pi ≈ 3.14 or 22/7. Circumference = pi × diameter; area = pi × radius × radius. Trap: do not mix radius and diameter (diameter = 2 × radius). Homophone: pie (food); the joke «pi» and «pie» is common. Pi is the same for every circle, big or small.

## On Mova

- [Trees and pragmatics of «pi» in the school dictionary](https://mova.elamur.ai/free/en/corpora/dictionaries/school/P/pi/): every meaning and example parsed by Mova, with its dependency tree and frames.
- [«pi» in the school dictionary](https://mova.elamur.ai/free/en/dictionaries/school/w/pi.html) on Mova free.
- [Trees and pragmatics of «pi» in the Judaism dictionary](https://mova.elamur.ai/free/en/corpora/dictionaries/judaism/P/pi/): every meaning and example parsed by Mova, with its dependency tree and frames.
- [«pi» in the Judaism dictionary](https://mova.elamur.ai/free/en/dictionaries/judaism/w/pi.html) on Mova free.