Solving the Mystery: The Square Root of 72

The concept of square roots is one of the most fundamental concepts in mathematics. It forms the basis of many complex mathematical operations and is used extensively in various fields, including statistics, physics, engineering, and economics. The square root of a number is an expression that represents the value of a number when multiplied by itself. For example, the square root of 4 is 2 because 2 x 2 = 4.

In this article, we will be focusing on the mystery surrounding the square root of 72. We will explore its properties, its relation to other numbers, and how we can calculate it.

Properties of the Square Root of 72

The square root of 72 is an irrational number. This means that it cannot be expressed as a fraction of two integers. Its decimal representation is infinite and non-recurring. The exact value of the square root of 72 is approximately 8.48528137.

Another interesting property of the square root of 72 is that it is a composite number. A composite number is a positive integer that has more than two factors. In the case of the square root of 72, its factors are 2, 3, 4, 6, 8, 9, 12, 18, 24, and 36.

Relation to Other Numbers

The square root of 72 has a connection to several other numbers, including the square root of 2, the golden ratio, and the Fibonacci numbers.

The square root of 72 is related to the square root of 2 through the Pythagorean theorem. The Pythagorean theorem states that in a right-angled triangle, the square of the hypotenuse (the longest side) is equal to the sum of the squares of the other two sides. If we assume that the two other sides have lengths of 1, then the hypotenuse has a length of the square root of 2. Similarly, if we assume that one of the other sides has a length of the square root of 2, then the hypotenuse has a length of 2. By using the Pythagorean theorem, we can find that the other side has a length of the square root of 2. If we multiply the square root of 2 by the square root of 36, we get the square root of 72.

The golden ratio is another number that is related to the square root of 72. The golden ratio is approximately 1.6180339887 and is found by dividing a line segment into two parts so that the longer part divided by the smaller part is equal to the whole length divided by the longer part. The golden ratio is present in many natural phenomena and is considered to be aesthetically pleasing. The value of the golden ratio is related to the square root of 72 because if we take the reciprocal of the golden ratio and add it to the golden ratio, we get the square root of 72.

The Fibonacci numbers are a sequence of numbers where each number is the sum of the two preceding numbers. The sequence starts with 0, 1, 1, 2, 3, 5, 8, 13, 21, 34… and continues infinitely. The ratio of consecutive Fibonacci numbers approaches the golden ratio as the sequence gets longer. Interestingly, the sum of the squares of the first ten Fibonacci numbers is equal to 72.

Calculating the Square Root of 72

There are several methods for calculating the square root of 72. One of the most common methods is to use long division. To begin, we place a bar over the 72 and group the digits by twos starting from the decimal point:

8|72.00000000

We then find the largest square that is less than or equal to the first group of digits, which is 49. We place the square root of 49 (which is 7) on top of the bar and subtract 49 from 72 to get 23.

8|72.00000000

-49

_______

23

We bring down the next pair of digits (00) and place them next to the remainder (23) to form 2300. We double the number on top of the bar (7) to get 14 and place it before a placeholder digit (x) under the 23:

8|72.00000000

-49

_______

23x

14

We find the largest number that, when multiplied by itself and then by the placeholder digit, is less than or equal to 2300. This number is 6, since 6 x 6 x x = 216x, which is less than 2300. We place 6 on top of the bar and subtract 216x from 2300 to get 84x.

8|72.00000000

-49

_______

23x

14[6]

84x

We bring down the next pair of digits (00) and place them after the 84x to form 8400. We double the number on top of the bar (76) to get 152 and place it before another placeholder digit (y) under the 84x:

8|72.00000000

-49

_______

23x

14[6]

84xy

152

We repeat the process of finding the largest number that, when multiplied by itself and then by the two placeholder digits, is less than or equal to 8400. This number is 2, since 2 x 2 x y = 4y, which is less than 8400. We place 2 on top of the bar and subtract 4y from 8400 to get a remainder of 40.

8|72.00000000

-49

_______

23x

14[6]

84xy

152[2]

40

At this point, we can continue the process to as many decimal places as desired. However, there are also other methods for calculating square roots, such as the Babylonian method or using a calculator.

Conclusion

In conclusion, the square root of 72 is an interesting number with several unique properties and relations to other numbers. While it may seem mysterious at first, there are various methods for calculating it as well as understanding its significance in mathematics. Whether you are a student, professional, or simply curious about mathematics, the square root of 72 is a fascinating topic to explore.