Learn English – How to refer on the property of a line which has a sudden change in its direction

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There is sudden (sharp, this means, it's not differentiable at that point) change in the gradient of a line:

A line starts off at 10 degrees off the horizontal, then about halfway along, it angles up to 55 degrees off the horizontal.

What is the proper way to refer to it, to not sound too mathematical.
For example, "this line has a kink in it" seems odd. "The line has a break in it" might mean that there is a gap.

Edit: what I would like to finally express is how one adds this property to the line. E.g: "With this method, you can add a [noun] to the line", or "you can [verb] the line."

I don't need to emphasize the abruptness (but don't want it to be misunderstood as making a curve out of it). I would just like to make it clear, in simple terms, what would happen to the line.

Best Answer

How about:

the line changes in steepness.

You can add more detail too, if you need to describe the level of change.

the line severely changes in steepness.

the line slightly changes in steepness.

Following discussion and your edits, I would suggest.

With this method you can add an angle to the line.

Or, if you're happy to use multiple words, you will be much clearer saying:

With this method you can add a change of direction to the line.

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