Right angle
A right angle is an angle with a measurement of 90 degrees or π/2 radians. While most angles are represented by a small sliver of a circle in their angle, right angles have a small square instead. This is why something that is 90 degrees is often referred to as "square" in woodworking. When two lines cross each other so that all the angles have the same size, the result is four right angles. This is known as "perpendicular". The top of the letter T is at right angles to the vertical line. Walls of buildings are usually at right angles to the floor. Two things that are at right angles to each other are called "perpendicular" or "orthogonal". This is expressed using the [math]\displaystyle{ \bot }[/math] symbol (such as in [math]\displaystyle{ \ell_1 \, \bot \, \ell_2 }[/math]).[1][2][3]
Planes (flat surfaces) can also meet at right angles. In a building, a wall and a floor are said to be perpendicular to each other, and they have a right angle. It also can be called a square angle.
Right Angle Media
A line segment (AB) drawn so that it forms right angles with a line (CD)
Right triangle, with the right angle shown via a small square
Another option of diagrammatically indicating a right angle, using an angle curve and a small dot
Related pages
References
- ↑ "List of Geometry and Trigonometry Symbols". Math Vault. 2020-04-17. Retrieved 2020-09-21.
- ↑ Weisstein, Eric W. "Perpendicular". mathworld.wolfram.com. Retrieved 2020-09-21.
- ↑ "Perpendicular - math word definition - Math Open Reference". www.mathopenref.com. Retrieved 2020-09-21.