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
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07, 2017
Sine waves – trigonometry – math
Sine wave In order to save energy, many, many things in nature move in a kind of repeated pattern we call a sine wave: water waves, sound waves, light waves, [...]
29
07, 2017
Cosine – Trigonometry – Math
Right triangle and cosine What is a cosine? A cosine, like a sine, is a mathematical way of thinking about a kind of movement that happens in nature. A cosine is [...]
29
07, 2017
What is a triangle? Simple geometry
This is an equilateral triangle. A triangle is any set of three points on a plane and the lines connecting those points to each other, as long as the three points aren't all on the [...]
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07, 2017
Right triangle – Simple geometry
This is a right triangle, because one of the angles is a right angle. A right triangle is any triangle where one of the angles is exactly 90 degrees, or a right angle. You [...]
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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 an isosceles triangle? Simple geometry
This is an isosceles triangle. Definition of an isosceles triangle Isosceles triangles have at least two sides that are exactly the same length. This forces two of their angles to also be acute angles of exactly [...]
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07, 2017
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 [...]
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07, 2017
What’s an angle? Geometry made simple
Two lines cross and form four angles Where any two lines cross each other, they form four angles. These angles are parts of a circle (as you can see from the green circle segments), [...]
