Pythagoras's' theorem or "got an want" on a right angled triangle but use sine rule on a non right angled triangle !! ..
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A right angle triangle has an hypotenuse which is its longest side, an adjacent side and an opposite side.
There can be no tangent side. The tangent of an angle, in a right angled triangle, is a ratio of the lengths of two sides.
Yes because the given dimensions comply with Pythagoras; theorem for a right angle triangle.
The perimeter of a triangle is side A plus side B plus side C. Since we are talking about a right triangle, if you know two sides, then you know the third by the Pythagorean Theorem: A2 + B2 = C2
The answer depends on what information you do have.