In this picture $AB=AC$ and
$\begin{array}{l} \angle A = 20 \\ \angle {B_1} = 70 \\ \angle {C_1} = 60 \\ \end{array}$
What is $\angle x$?
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The angle of the vertex $x$? – Filburt Apr 08 '17 at 18:41
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@Filburt - Please more guide. – Tp-link Apr 08 '17 at 18:50
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Related: "Finding an angle within an 80-80-20 isosceles triangle", where the known angles are a little different. (In that form, this is Langley's problem. See also Cut-the-Knot's entry on the problem.) – Blue Apr 08 '17 at 18:52