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 [...]
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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 [...]
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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 [...]
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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, [...]
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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 [...]
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07, 2017
Perpendicular lines – Simple geometry
Perpendicular lines Two lines are perpendicular if they cross at right angles. You can test this by extending the lines until they cross (if they do not cross then they are parallel). Where the [...]
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07, 2017
Parallel lines – Simple geometry
Two parallel lines Two lines are parallel if they are in the same plane but they can go on forever without ever crossing. You can test this by seeing if you can [...]
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07, 2017
What is a line? Simple geometry
A number line is infinite in both directions - definition of a line A line of points A line is made of an infinite number of points that are right next [...]
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07, 2017
Diameter of a circle – Geometry
The geometry of a circle The diameter of a circle is the distance across the circle at the widest part of the circle. The diameter is always equal to twice the radius of the [...]
