# It looks easy

Geometry Level 2

Given isosceles triangle $$ABC$$, with $$\angle ABC= \angle ACB=50°$$ and $$AB=AC$$. $$M$$ is a point inside triangle $$ABC$$ whether $$\angle MBC=10°$$ and $$\angle MCB=20°$$. What is the measure of $$\angle AMB$$ (in degrees)?

P/s: Try to use pure geometry!

The image isn't accurate!

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