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King Arthur’s Britain – Medieval history

By |2019-02-04T04:40:50-07:00August 2nd, 2017|History, Medieval|

Like the people King Arthur was fighting: Sutton Hoo Anglo-Saxon helmet (500s-600s AD, now in the British Museum) The end of Roman Britain When Constantine III revolted in England in 406 AD and took all its Roman troops with him to France, that was really the end of Roman control in Britain. Who was Constantine III? The Roman [...]

Equilateral triangle – Simple geometry

By |2019-05-30T20:07:26-07:00July 29th, 2017|Math|

This is an equilateral triangle. What makes a triangle equilateral? Equilateral triangles have all three sides exactly the same length. Because their sides are the same length, the three angles of an equilateral triangle are also all the same size, so they're each one third of 180 degrees, or 60 degrees. What is a triangle? What are angles? All [...]

What’s an angle? Geometry made simple

By |2017-07-29T10:01:22-07:00July 27th, 2017|Math|

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), so, like a circle, they have to add up to 360 degrees. If the two lines are perpendicular to each other, then the four angles [...]