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an angle that forms a linear pair with one of the interior angles of the triangle.
It means the ratio of the opposite angle to the hypotenuse of a triangle for angle "x". This is for a right triangle.
When placed next to any angle on a triangle, the theta symbol (θ) represents that missing angle.
right angle triangle
A right angle triangle has an hypotenuse which is its longest side, an adjacent side and an opposite side.