What is a 90 degree angle?
Online math tutors at CrunchGrade teaching Year 4 students about right angles often use the following definition:
A right angle is an angle whose two sides form a 90-degree angle.
In other words, a right angle is an L-shaped angle, where the two shorter sides form a perfect 90-degree angle. You can also think of a right angle as an angle that looks like a corner.
Right angles are found all around us in everyday life. For example, the corners of a square or rectangle are all right angles. You create a right angle when you fold a piece of paper in half. Right angles are also present in many common objects, such as hammers and screwdrivers.
If an angle is not a right angle, we call it an obtuse angle or an acute angle. An obtuse angle is an angle whose two sides form an angle greater than 90 degrees but less than 180 degrees. An acute angle is an angle whose two sides form an angle less than 90 degrees.
Right angles or 90-degree angles play a very prominent role in mathematical learning. A whole branch of maths, Trigonometry, is based on the study of the relationship between angles and sides of right-angled triangles (triangles in which at least one angle is 90 degrees). In geometry, many theorems and formulas involve right angles.
So, to recap, a right angle is an angle whose two sides form a perfect 90-degree angle. Right angles are found around us in everyday life and play a crucial role in many branches of mathematics. For example, the Pythagorean theorem states that in a right-angled triangle, the square of the length of the hypotenuse (the longest side) is equal to the sum of the squares of the other two sides.
This theorem is represented by the equation: a^2 + b^2 = c^2.
Also, read – How To Find The Base Of A Triangle?
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