Ask Uncle Colin: Bridges, Donkeys and Triangles | Colin

Ask Uncle Colin is a chance to ask your burning, possibly embarrassing, maths questions — and to show off your skills at coming up with clever acronyms. Send your questions to colin@flyingcoloursmaths.co.uk and Uncle Colin will do what he can.

Dear Uncle Colin,

I’m struggling to understand why, if you know a triangle has two sides the same, the base angles must be the same. Can you explain?

— I’m Struggling Over Some Coherent Explanation Leveraging Equal Sides

Hi, ISOSCELES, and thanks for your message!

There are several good proofs of this, but my favourite is known as the Bridge…

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