Answer:
1.
a straight line or plane that touches a curve or curved surface at a point, but if extended does not cross it at that point.
2.
a completely different line of thought or action.
"he quickly went off on a tangent about wrestling"
3.
Mathematics
the trigonometric function that is equal to the ratio of the sides (other than the hypotenuse) opposite and adjacent to an angle in a right triangle.
Step-by-step explanation:
Those are the dictionary definitions. Since you said it was English I think 2 would probably help you the most