All angles marked are between a median and a side of the triangle. Find , in degrees. If multiple solutions exist, average them.
Note: drawing not to scale.
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One of the solutions is obvious, x = 3 0 ∘ , with the overall triangle being equilateral. But there is a second solution.
To find it, let’s concentrate on the triangle △ A B E . ∠ E A B = ∠ E B G = 3 0 ∘ . Also A G = 2 × G E . Such a triangle can be constructed in an alternative way as shown below.
The rest of the △ A B C can be easily shown to exist. The angle x = 9 0 ∘ , so the average, and therefore the answer, is 6 0 ∘ .