An angle of 90 degrees is called a right angle. Right angles are one of the fundamental concepts in geometry and are essential in various applications, such as architecture, engineering, and design.
The term ‘right’ comes from the Latin word ‘rectus’, meaning ‘straight’ or ‘upright’. A right angle is formed when two lines intersect such that they create a perfect corner, resembling the shape of the letter ‘L’. Visualizing a square or rectangular shape can help you understand right angles better, as each corner of these shapes measures 90 degrees.
In mathematical terms, right angles are often represented using a small square placed at the angle’s vertex. This notation signifies that the angle measures exactly 90 degrees, distinguishing it from acute angles (which measure less than 90 degrees) and obtuse angles (which measure more than 90 degrees).
Understanding right angles is crucial not only in geometry but also in everyday life, such as when constructing objects or determining level surfaces.