Because it leads to the limit concept which in turn leads to concept of derivative...
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Although normally it is the line that is considered to be tangent to an arc, an arc can be tangent to infinitely many lines and so the answer to the question is: in infinitely many ways.
parallel lines never touch, never get any closer or any further apart. tangent lines touch at one point
You can have a tangent line for every point on a circle, so the answer is theoretically infinite.
A secant line touches a circle at two points. On the other hand a tangent line meets a circle at one point.
Tangent to the curve.