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Right-angled running track draws flak in Songkhla

A new 30-million-baht sports complex in Songkhla province has drawn sharp public criticism for a sharply angled running track that is not safe or practical for use. The authorities responsible for the ...
BBC

How to prove Pythagoras' theorem

STEP 1 - RIGHT TRIANGLE x 4: Take one piece of card and fold it in half, then fold it in half again... Image caption, ... use the ruler and pencil to draw a straight line across the bottom corner of ...