pi

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29 07, 2017

What is a radius? The geometry of a circle What is a radius? The radius of a circle is the distance from the center point to the edge of the circle. It's the same [...]

28 07, 2017

Proof for the area of a circle

Proof for the area of a circle: Divide a circle up into sections like an orange Euclid's proof We know it's true that A=πr-squared is the area of a circle, but how can we prove [...]

28 07, 2017

Area of an oval – Geometry

Area of an oval The area of an oval is the part of a plane that is inside its circumference. To figure out the area, you need to measure the height and width of the oval. [...]

28 07, 2017

Area of a circle – Geometry

The geometry of a circle The area of a circle is the flat surface inside its circumference. The area is always equal to the radius squared, multiplied by π (pi). Here's a proof that [...]

18 07, 2017

Greek mathematics – Geometry and Proofs

By |2019-08-19T21:34:39-07:00July 18th, 2017|Greeks, Math|1 Comment

Greek mathematics: An Egyptian papyrus from about 100 AD which is a piece of one of Euclid's books Greek math: geometry not algebra Because people in ancient Greece had only very clumsy [...]

7 06, 2017

Math and Numbers in Ancient China

By |2019-10-15T09:08:44-07:00June 7th, 2017|China, Science|0 Comments

Chinese numbers: number rods Chinese numbers People in China were using written numbers by about 1500 BC, in the Shang Dynasty. This is about two thousand years later than people began [...]