A 90 degree angle is a type of angle that is formed when two lines intersect at a right angle. This is one of the most popular angles because it is very easy to create and is very versatile. A 90 degree angle can be used in a variety of different applications, such as in geometry, engineering and construction. Additionally, a 90 degree angle is also known as a Right Angle.
Derivation of 90 degree
The meaning of "right" in right angle probably assign to the Latin adjective rectus. It can be defined into upright, straight, erect for perpendicular. The Greek relevant is orthos, which refer to straight or perpendicular.
What Geometry and Trigonometry says
According to geometry and trigonometry, a right angle is an angle of 90 degrees compatible with a quarter turn. If a line is placed so that its finishing point is on a line and the adjacent angles are similar then it is a right angle. The word is a calcu of Latin angelus apply means straight notifying to the vertical perpendicular to a horizontal ground line. Perpendicular lines are important to geometric theory, meaning that lines that make right angles at their points of intersection and practiced applied to vectors. The existence of the right angle in a triangle is the evaluating element for right Triangles, forming the right angle basic to trigonometry.
90 degree in Geometry
A rectangle is a quadrilateral, means a angle which have four right angles. Square has identical four right angles length sides.
The Pythagorean theorem describes, how to determine whether a triangle is a right angled triangle.
Shape of Right angle
A right angle equally the alphabet L. It can be remarked in many forms like the angle made by the clock hands at 9 AM, edges of temple, screen of the mobile, corner of the Table, four edges of a box and  other places, we can also see them.
Modes of angles
In trigonometry, various modes of angles are assigned and named by their angle dimensions. Right angle is 90 degrees. The angle which is less than named an acute angle. More than 90 degrees angle called obtuse angle.
These angles also help define the multiple kinds of triangles. Right triangle is any triangle that includes a right angle. An obtuse triangle is a triangle that contains an obtuse angle greater than 90 degrees.
An acute triangle is a triangle with less than 90 degrees three acute angles. It contains a right angle and an obtuse angle and an acute angle.
Need of 90 degree angles
Polygons have particular traits. If two straight lines intersect at a 90 degree angle, it means it is a perpendicular. Perpendicular lines have many uses in Geometric calculation and studying different vertices and angles. They are also useful for understanding correct straightness and alignment in those areas which are related to construction or painting.
Conclusion
Although, 90 degree angle used for practical applications. From construction to organisation, architecture and engineering, driving, measuring distances or angles on a grid and many more we can see right angles used in all aspects of life.

What is a 90 degree angle?