Angles: type of angles, measure and operations

Are the following affirmations true?

An angle is the point where two lines intersect, also called a vertex.
The angles of $90$ degrees are right angles.
A full angle is two straight angles.
$90^\circ+ 90^\circ+ 90^\circ+ 90^\circ+ 90^\circ = 90^\circ$
$-90^\circ-90^\circ-90^\circ-90^\circ-90^\circ = 90^\circ$
If we do the bisector angle of the bisector angle of a given angle we obtain a quarter of the original angle.

An angle is the aperture formed by two straight lines, not the intersection point.
The angles of $90$ degrees are called right angles. Straight angles are $180$ degrees.
A straight angle is one of $180^\circ$. If we add two of them together we obtain $360^\circ$, which is a full angle.
$90^\circ+ 90^\circ+ 90^\circ+ 90^\circ+ 90^\circ = 450^\circ = 90^\circ$
$-90^\circ-90^\circ-90^\circ-90^\circ-90^\circ = -450^\circ = -90^\circ$
The bisector angle divides the angle in $2$ parts. If we calculate the bisector angle twice (in other words, the bisector of the bisector angle), we will get an angle that is a quater of the original.