Q:

# Who invented pi?

A:

A mathematics teacher named William Jones is credited with first using the symbol π in 1706 to represent the concept of the ratio between a circle's circumference and diameter. It had previously been ill-defined.

## Keep Learning

Prior to Jones' usage of the π symbol, the ratio of a circle's circumference and diameter was known as "the quantity which, when the diameter is multiplied by it, yields the circumference." William Jones first used the symbol in his book, "Synopsis Palmariorum Matheseos, or A New Introduction to the Mathematics." Jones believed, but could not prove, that pi was irrational. In 1761, Johann Lambert first proved that pi was an irrational number.

Sources:

## Related Questions

• A: The perimeter of a semicircle is 1/2 of the circumference of the corresponding complete circle plus the diameter of the circle. The distance around the out... Full Answer >
Filed Under:
• A: Find the diameter of a circle with a given circumference by solving for the formula "d=C/pi," where d is the diameter, C is the circumference and pi is 3.1... Full Answer >
Filed Under:
• A: To find the circumference of a circle, multiply the diameter by pi or double the radius times pi. Pi is an unchanging number that rounds off to 3.14.... Full Answer >
Filed Under:
• A: To calculate a circle's diameter from its circumference, one should divide the circumference by the constant pi, which is an irrational number approximatel... Full Answer >
Filed Under:
PEOPLE SEARCH FOR