Search IntMath
Close

450+ Math Lessons written by Math Professors and Teachers

5 Million+ Students Helped Each Year

1200+ Articles Written by Math Educators and Enthusiasts

Simplifying and Teaching Math for Over 23 Years

# What is a Right Angle?

In geometry, a right angle is an angle that bisects the angle formed by two halves of a line. The two halves of the line are called the legs of the angle. The vertex of the angle is the point where the two lines intersect. The sides of the angles are perpendicular to each other. The measurement of a right angle is always 90 degrees.

Right angles are important in geometry because they are used to define other types of angles. Acute angles are angles that are less than 90 degrees and obtuse angles are angles that are greater than 90 degrees but less than 180 degrees.

Right angles also have special properties that make them easy to work with when solving geometry problems. For example, the legs of a right triangle are always equal to the length of the hypotenuse (the longest side). This relationship between the sides of a right triangle is called the Pythagorean theorem.

## The Pythagorean Theorem

The Pythagorean theorem states that in a right angled triangle, the square of the length of the hypotenuse 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

Where:

a and b represent the lengths of the shorter sides (also called legs)

c represents the length of hypotenuse

This theorem is named after Greek mathematician Pythagoras who first discovered it.

The theorem is used extensively in mathematics and has many applications in real life situations. For example, carpenters use it to calculate roof pitches, electricians use it to calculate cable lengths, and surveyors use it to calculate property boundaries.

The theorem can be used to solve for any one side if you know the lengths of the other two sides. For example, if you know that Side A = 3 and Side B = 4 then you can use the formula to solve for Side C which is equal to 5.

## Conclusion

Right angles play an important role in geometry by defining other types of angles and having special properties that make them easy to work with when solving problems. The most famous property of a right angled triangle is known as the Pythagorean theorem which states that in a right angled triangle, the square of length of hypotenuse is equal to sum of squares of other two sides. This theorem has many applications in real life situations and can be used to solve for any one side if you know lengths of other two sides.

## FAQ

### What is a right angle in geometry?

A right angle is an angle that bisects the angle formed by two halves of a line. The two halves of the line are called the legs of the angle. The vertex of the angle is the point where the two lines intersect. The sides of the angles are perpendicular to each other. The measurement of a right angle is always 90 degrees.

### How do you explain a right angle to a child?

A right angle is an angle that bisects the angle formed by two halves of a line. The two halves of the line are called the legs of the angle. The vertex of the angle is the point where the two lines intersect. The sides of the angles are perpendicular to each other. The measurement of a right angle is always 90 degrees.

### Why is it called a right angle?

It is called a right angle because the sides of the angles are perpendicular to each other. The measurement of a right angle is always 90 degrees.

### Which angle is right angle?

The angle that bisects the angle formed by two halves of a line is called a right angle. The measurement of a right angle is always 90 degrees.