Example of 90° angle in real life
- Corners of a Square or Rectangle: When you look at the corners of a square or a rectangle, each corner makes a 90-degree angle.
- Books on a Shelf: When books are neatly placed upright on a shelf, the spine of the book forms a 90-degree angle with the shelf surface.
- Classroom Board and Floor: The board in a classroom is usually placed upright, forming a 90-degree angle with the floor.
- Window Frames: The corners of most window frames form 90-degree angles, just like the corners of a square or rectangle.
- Street Intersections: Many streets intersect at right angles, forming 90-degree angles at the corners where they meet.
Constructing 90 Degree Angle
In geometry, learning how to make a 90°, also called a right angle, is fundamental. Not only is it helpful in the construction of other angles like that of 60°, 45°, 120°, 30°, etc., but it also has lots of practical applications in real life, among which are distance measurements between planets and construction of buildings and other infrastructures. Although 90° can be quickly drawn with a protractor, this is an essential skill for students to accurately construct 90° with a compass and ruler.
In this article, we will learn to draw an angle of 90 degrees with a compass and ruler step by step.