Ask Uncle Colin: A Triangle That’s Not As Nice As It Looks | 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 and Uncle Colin will do what he can.

Dear Uncle Colin,

I need to find an angle! ABC is a triangle with median AD, while angles BAD and CAD are 110º and 20º, respectively. What’s angle ACB?

— Angle Being Evasive, LOL

Hi, ABEL, and thanks for your question! Even if you’ve used degrees. For heaven’s sake, get a grip.

I’d start by drawing a picture, which you can do yourself1,…

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