# What is the Square Root of 20: Understanding the Basics

As a mathematical concept, the square root of 20 is a value that, when multiplied by itself, gives a result of 20. In other words, it is the number that can be multiplied by itself to obtain the original number. The square root of 20 is not a whole number, but rather an irrational number, which means that it goes on indefinitely after the decimal point without repeating. The exact value of the square root of 20 is approximately 4.472.

## Finding the Square Root of 20

There are several methods to calculate the square root of 20, including the long division method, the prime factorization method, and the approximation method using a calculator or computer program.

### Long Division Method

The long division method involves dividing the number into two equal parts and finding the square root of each part separately. The process is repeated until the desired accuracy is achieved.

### Prime Factorization Method

The prime factorization method involves finding the prime factors of the number and grouping them in pairs. The square root of each pair is multiplied together to get the square root of the original number.

### Approximation Method

The approximation method involves using a calculator or computer program to find the square root of the number to a desired number of decimal places.

## Properties of the Square Root of 20

The square root of 20 has several interesting properties that make it useful in various mathematical calculations. Some of these properties are:

• The square root of 20 is an irrational number.
• The square root of 20 is greater than 4 and less than 5.
• The square of the square root of 20 is equal to 20.
• The square root of 20 is a solution to the equation x^2 – 20 = 0.

## Applications of the Square Root of 20

The square root of 20 has many applications in different fields of study, including mathematics, physics, engineering, and finance. Some of its applications are:

• In geometry, the square root of 20 is used to find the diagonal of a square whose sides are of length 10 units.
• In physics, the square root of 20 is used to calculate the velocity of an object that has a kinetic energy of 20 joules and a mass of 1 kilogram.
• In engineering, the square root of 20 is used to find the total resistance of two resistors that are connected in parallel and have values of 5 ohms and 20 ohms.
• In finance, the square root of 20 is used to calculate the standard deviation of a set of 20 data points.

## FAQs about the Square Root of 20

Here are some frequently asked questions about the square root of 20:

### What is the exact value of the square root of 20?

The exact value of the square root of 20 is approximately 4.472.

### Is the square root of 20 a rational or irrational number?

The square root of 20 is an irrational number, which means that it goes on indefinitely after the decimal point without repeating.

### How can I calculate the square root of 20?

You can calculate the square root of 20 using the long division method, the prime factorization method, or the approximation method using a calculator or computer program.

### What are the properties of the square root of 20?

The square root of 20 has several properties, including being an irrational number, greater than 4 and less than 5, the square of the square root of 20 is equal to 20, and it is a solution to the equation.