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.
Know MorePrior 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.
Learn more about InventionsGuglielmo Marconi is credited with inventing the first radio. Marconi achieved this feat with no formal education. Still a young man when he initially previewed his invention, his parents moved the entire family from Italy to England for a greater potential for success.
Full Answer >Although the concept was envisioned by AT&T, Martin Cooper is credited with inventing the cell phone. Essentially, Cooper focused on creating a "car phone" that would become the first cell phone in 1973.
Full Answer >The concept of mapping the Earth using two sets of parallel lines, one running from north to south and the other from east to west, was first utilized by the Greek Eratosthenes. Hipparchus, another Greek, was the first to use these lines as coordinates for specific locations.
Full Answer >Dr. James Naismith is credited for inventing netball. The no-dribble game was a spinoff of basketball that he invented in 1891 at a YMCA in Springfield, Mass.
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