Law of cosines
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Yes, it can. And if you do the math, some basic trigonometry, you can calculate the angles in the triangle.
Sides and Angles in a TriangleBy definition, a triangle has three sides. Since the number of sides and angles is equal, it would also have three angles.
False - and false ! Not ALL angles are right-angles - and a triangle has THREE sides !
The perimeter of a triangle is simply the sum of the lengths of its three sides. Knowing that it is right angles (or not) is rarely of help.
It's probably a triangle. A triangle has three sides and three angles.