# area

29 07, 2017

## What is a hexagon? Simple geometry

By |2019-08-13T22:11:41-07:00July 29th, 2017|Math|Comments Off on What is a hexagon? Simple geometry

This is a hexagon. See, it has six sides that are all the same length. Definition of a hexagon A hexagon is a flat shape, all in one plane, with six [...]

29 07, 2017

## Checking the surface area of a sphere

By |2017-07-29T09:44:05-07:00July 29th, 2017|Math|Comments Off on Checking the surface area of a sphere

Did you ever have to wrap a basketball as a present? To see how the surface area of a sphere is really 4πr2, find a ball to wrap (a basketball works well). Cut some [...]

29 07, 2017

## Volume of a cone – Geometry

By |2017-07-29T09:28:52-07:00July 29th, 2017|Math|Comments Off on Volume of a cone – Geometry

How much ice cream fits inside this cone? A cone is the set of all the line segments that start from one circle and go to a point not on the circle. You could think of [...]

28 07, 2017

## Proof for the area of a circle

By |2019-04-06T08:43:58-07:00July 28th, 2017|Math|Comments Off on 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

## Definition of a circle – Geometry

By |2017-07-28T08:36:58-07:00July 28th, 2017|Math|Comments Off on Definition of a circle – Geometry

A circle is the set of points on a plane that are all the same distance away from a center point. A circle is the set of points on a plane that are all [...]

28 07, 2017

## Area of a triangle – Geometry

By |2017-07-28T00:05:09-07:00July 28th, 2017|Math|Comments Off on Area of a triangle – Geometry

Area of a triangle To figure out the area of a triangle, multiply the base by the height of the triangle, and then divide by two: (Base x Height)/2. That's because the height [...]

28 07, 2017

## Area of an oval – Geometry

By |2018-04-23T15:59:52-07:00July 28th, 2017|Math|Comments Off on 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

By |2017-07-28T00:00:26-07:00July 28th, 2017|Math|Comments Off on 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 [...]

7 06, 2017

## What are the Nine Chapters? Math in Ancient China

By |2018-04-18T17:47:38-07:00June 7th, 2017|China, Science|Comments Off on What are the Nine Chapters? Math in Ancient China

Nine Chapters: How to figure out the area of an isosceles triangle. A math textbook from Han Dynasty China The earliest Chinese mathematical textbook is called the Nine Chapters. It [...]

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