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# How many triangles?

The number of non-congruent triangles $$ABC$$ such that $$\angle A=25^{\circ}$$, $$AB = 10$$ and $$BC = \alpha$$, where $$\alpha \in \mathbb{R}^{+}$$ is:

• exactly one

• at most one

• at most 2

• none of the above.

Note by Paramjit Singh
3 years, 1 month ago