straight angle
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If you mean an angle then an angle is formed by two straight lines meeting at a vertex.
Such angles are called vertically opposite angles.
An angle is formed by a point on the end and two rays
This is the definition of an inscribed angle in geometry. An inscribed angle is formed by two chords in a circle that also share a common point called the vertex.
If you mean hypotenuse then it is the largest side of a right angle triangle and it is opposite a 90 degree angle.