Obtuse
Yes, For a line set that has an angle greater than 90 degrees, the line set is "OBTUSE".
For a line set that has an angle less than 90 degrees, the line set is "ACUTE".
For a line set that has an angle equal to 90 degrees, the line set is "RIGHT ANGLE".
Kinked.
vertical; straight up and down; upright; meeting a given line or surface at right angles.
A pair of angels in a straight line formed by a line or half-line meeting it is called adjacent angels. Adjacent angels will add up to 180°.
The word straight does have an antonym, which is crooked. So perhaps a crooked line is the opposite of a straight line.
for example a straight line.(is it straight up and down)
It is possible that this the question concerns upper case letters in the Roman alphabet, and excludes angle between a straight line and a curve (the curved part of P meets the vertical straight at right angles). In that case, one possible answer is WAFT.
A line on the coordinate plane where all points on the line have the same x-coordinate. A line that goes straight up and down. A vertical line has no slope. a line that you can't possible be found going horizontal
for example a straight line.(is it straight up and down)
Nonlinear
Ray.
Line up outside the ship.Make sure you line these up straight.
The word straight doesn't really apply to an equation. However the graph of a linear equation is a straight line.