That would be a Complementary Angle.
An angle is formed where two lines meet. Parallel lines do not meet. Therefore they do not form an angle. So there is no angle to have a name. So no name.
They are called perpendicular.
An angle greater than 90 degree is an obtuse angle.
complete angle
A right angle
An angle is formed where two lines meet. Parallel lines do not meet. Therefore they do not form an angle. So there is no angle to have a name. So no name.
That's the "vertex" of the angle.
They are called perpendicular.
An angle greater than 90 degree is an obtuse angle.
A right angle
An acute angle
Acute angle
complete angle
A right angle
A right angle
if the two line intersect at 90 degree then these are called perpendicular lines
straight angle