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
29
07, 2017
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
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
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
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
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
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
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
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
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 [...]
