Adjacent means 'next to'
Assuming that you mean diagonal (not diagnol) lines, they are straight lines that join non-adjacent vertices in a polygon or polyhedron.
They are straight joining vertices to non-adjacent vertices.
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°.
Supplementary
2 supplementary adjacent angles for a straight angle.
Yes
Sum of adjacent angles on a straight line.
In math, adjacent refers to two angles or sides that share a common vertex and side but do not overlap. Adjacent angles add up to 180 degrees in a straight line, while adjacent sides share a common endpoint or vertex.
Because that is what a straight line (or straight angle) is.
it is a line that is only straight
Adjacent means 'next to'
Well, they're called vertically adjacent angles. They have the property that they are supplementary, because the non-adjacent sides form a straight line.
Assuming that you mean diagonal (not diagnol) lines, they are straight lines that join non-adjacent vertices in a polygon or polyhedron.
They are straight joining vertices to non-adjacent vertices.
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°.
Supplementary