Antonym means the opposite. So the opposite of angle is a straight line.
tunnel? Or straight path.
curved, twisted
Yes. If it is not straight, then it is not a line.
it just a straight line
Straight line
Antonym means the opposite. So the opposite of angle is a straight line.
An antonym for creased is straight or smooth
The antonym for crooked is straight.
The answer depends on the context. In the context of a curve, a tangent is a straight line that touches the line without intersecting it. The antonym does not have a specific name because it could be a straight line that does not meet the curve at all, or it could be one that crosses the curve. Note that even a tangent can cross the curve at some other [distant] point(s).
Well, I think circumflex itself doesn't have an antonym, but it means to bend around or curve, you can try and look up for a synonym for curve. It could be straighten/straight or line.
straight
the opposite of straight is crooked or wavy.
A synonym for straight is unbent.
bent backward
oval, or straight
tunnel? Or straight path.