What are Obliques?
Bevel is a concept in exponential geometry. Bevel is an angle that is not an integer multiple of a right angle. [2]
Bevel right angle
- A right angle is also called a positive angle in geometry and trigonometry, and is an angle of 90 degrees. It is relative to a quarter of a circle (that is, a quarter of a circle). Because the center angle of the circle is divided into 360 degrees, a right angle is equal to 90 degrees, and two right angles are equal to a flat angle (180 °). .
- In ancient times, it was necessary to draw the ink line for houses, etc. The ink line was required to be perpendicular to the ground, and such an angle is called "vertical angle" in life, or "right angle" for short.
Bevel angle
- 1 circumference angle = 360 ° = 4 right angles. The ancients found that the size of this angle is equal to the circumference, so it is called "circumference angle", referred to as "circumference angle".
Bevel angle
- 1 flat angle = 180 ° = 2 right angles, the ancients found that the two rays of this angle just emitted in two opposite parallel directions, so it is called "flat angle".
Obtuse angle
- The angle between two straight lines greater than the right angle (90 °) and less than the flat angle (180 °) is called an obtuse angle. "Blank knife cuts meat-the more it cuts, the more pain", the ancients found that this angle is similar to the shape of the "blunt knife", so it is called "blunt angle".
Oblique angle
- Angles greater than 0 ° and less than 90 ° (right angle) are acute angles, and acute angles are bad angles. The addition of two acute angles is not necessarily greater than a right angle, but it must be less than a flat angle. "The sharp cannot be taken". The most important thing for the ancient army to attack is the spirit. This kind of angle is similar to the army formation with sharp spirit, so it is called "acute angle". [3]
Bevel angle
- Angles smaller than a flat angle are called bad angles, and acute, right-angle, and obtuse angles are all bad angles.
Bevel angle
- Angles that are greater than the flat angle and less than the peripheral angle are called superior angles, and the superior angle is greater than 180 ° and less than 360 °. [4]