# circle

Home/Tag: circle
16 09, 2017

## West Asian mathematics – history of math

By |2019-09-04T05:49:16-07:00September 16th, 2017|West Asia|0 Comments

History of math: Sumerian multiplication table (2700 BC) Cuneiform multiplication table Once people in West Asia figured out how to write down numbers, about 3500 BC, they quickly began to want to use cuneiform to [...]

16 08, 2017

## What is centrifugal force? Physics definitions

By |2019-03-11T05:58:01-07:00August 16th, 2017|Islam, Physics|0 Comments

Kids playing tetherball using centrifugal force Who first explained centrifugal force? When something is going straight, it always keeps going straight unless something else stops it or turns it. (The [...]

29 07, 2017

## Tangents – trigonometry – math

Tangents: This line is tangent to a circle. What is a tangent? A tangent, like a sine or a cosine, is a mathematical way of thinking about a kind of movement that happens [...]

29 07, 2017

## Area of a sphere – Volume of a sphere

This is a sphere. A sphere is a three-dimensional circle. Or you could say that a sphere is the set of all the points that are at the same distance from the center [...]

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 [...]

29 07, 2017

## What is a plane? Simple geometry

A plane goes on infinitely in all directions. Just as a line is made of an infinite number of points, a plane is made of an infinite number of lines that are right [...]

29 07, 2017

## What is pi? Simple geometry – Math, circles, circumference, diameter

What is pi? The geometry of a circle What is pi? Pi is a number that is just a little bigger than 3.14. It is the number you get if you divide [...]

29 07, 2017