The angle is the point where two lines meet or intersect, so that an angle can exist, it is necessary that the point intercept the lines ( Mathematics ... , Charles D. Miller, et al.)
For example the point Z, does not have an angle since it does not pass through any vertex of straight lines
It is the one that has two perpendicular lines, and the distance in degrees between one straight line and another is 90º.
The angular opening is represented by two perpendicular lines that touch the two lines. So that when we see this angular representation we know that it is a right angle
It is which the lines share the same vertex and they are separated by an angle greater than 0º and less than 90º, the angular opening is represented by a curved line that the two lines touch.
It is which the lines share the same vertex and are separated by an angle greater than 0º and 90º and less than 180º.
These are the ones whose lines share the same vertex and are separated by a 180º angle exclusively.
Mathematics is the language with which God has written the universe.
- Galileo Galilei (1564/1642)
I have hardly ever known a mathematician who was capable of reasoning.
- Plato (427—347 B.C.E.)
Mathematics is the queen of the sciences.
- Carl Friedrich Gauss (1777/1855)
There is geometry in the humming of the strings, there is music in the spacing of the spheres (planets).
- Pythagoras (569/500 B.C.E)
The laws of nature are but the mathematical thoughts of God.
- Euclid( c. 300 B.C.E)
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