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King Arthur’s Britain – Medieval history

By |2017-08-02T12:48:02+00:00August 2nd, 2017|History, Medieval|

Sutton Hoo Anglo-Saxon helmet (500s-600s AD, now in the British Museum) 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. The British seem to have written to the Romans asking them to come help out in the 420s. They [...]

Equilateral triangle – Simple geometry

By |2017-07-29T09:56:35+00:00July 29th, 2017|Math|

This is an equilateral triangle. 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. All three angles of any equilateral triangle are 60 degrees, no matter how [...]

What’s an angle? Geometry made simple

By |2017-07-29T10:01:22+00:00July 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 [...]