Are the following affirmations true?

- An angle is the point where two lines intersect, also called a vertex.
- The angles of $$90$$ degrees are straight 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.

See development and solution

### Development:

- 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.

### Solution:

- False
- False
- True
- True
- False
- True