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"Solving" a triangle is where they give you a side and an angle of a right triangle, and you have to use SohCahToa (sine, cosine & tangent) to get the remaining sides and angle. Why not use Pythagorean, you ask? Because in trig problems they only give you one side. Teachers are tricky, I'm telling you!
If you do not have an account, you should get one, because it is awesome! You can save a playlist for each test or each chapter, and save your "greatest hits" into a "watch right before the final" list (not that we recommend cramming, but when in Rome...)