# plane

29 07, 2017

## What is infinity? Math and numbers

Infinity: A number line is infinite in both directions. No end to the number line When we think about the number line, we can see that there's no end to it [...]

29 07, 2017

## Numbers and math

By |2018-04-24T07:56:24-07:00July 29th, 2017|History|Comments Off on Numbers and math

A number line is infinite in both directions. Numbers are a convenient way for people to organize their thoughts about space and time. First we can think of zero as a point, taking up no [...]

29 07, 2017

## What is area? Simple geometry

By |2017-07-29T13:29:39-07:00July 29th, 2017|Math|Comments Off on What is area? Simple geometry

Calculating the area of your room. The area of a room is the size of the floor. Suppose you wanted to find out whether your room was really bigger than [...]

29 07, 2017

## What is a trapezoid? Simple geometry

By |2017-07-29T13:16:13-07:00July 29th, 2017|Math|Comments Off on What is a trapezoid? Simple geometry

This is a trapezoid. A trapezoid is a kind of quadrilateral that has at least two sides that are parallel to each other. A parallelogram is a trapezoid that has two pairs of parallel [...]

29 07, 2017

## Solids – Platonic solids – Geometry

By |2017-07-29T13:08:07-07:00July 29th, 2017|Math|Comments Off on Solids – Platonic solids – Geometry

Pyramid Just as a plane is made of an infinite number of lines, a solid is made of an infinite number of planes. These planes are right next to each other, like [...]

29 07, 2017

## What is skew? Skew lines – Geometry

By |2017-07-29T13:03:09-07:00July 29th, 2017|Math|Comments Off on What is skew? Skew lines – Geometry

These two green lines are skew to each other. Skew is a pretty cool word, and it sounds like it means something really weird, and it kind of does. It [...]

29 07, 2017

## What is a rhombus? Simple geometry

By |2018-04-23T16:01:48-07:00July 29th, 2017|Math|Comments Off on What is a rhombus? Simple geometry

This is a rhombus, divided so you can figure out the area. A rhombus is a kind of quadrilateral that has two sides that are parallel to each other, and another two sides that [...]

29 07, 2017

## Rectangle – area and perimeter

By |2018-04-23T16:01:22-07:00July 29th, 2017|Math|Comments Off on Rectangle – area and perimeter

This is a rectangle. A rectangle is a flat shape, in one plane. It's defined by four points at the four corners. A rectangle has two sides of equal length opposite each other, [...]

29 07, 2017

## What is a point? Simple geometry definitions

By |2018-06-01T16:50:35-07:00July 29th, 2017|Math|Comments Off on What is a point? Simple geometry definitions

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

29 07, 2017