<center>![the-pythagorean-formula.png](https://res.cloudinary.com/hpiynhbhq/image/upload/v1516018374/bymisl5pbx98zgf1waq6.png)
[image source](https://i0.wp.com/www.mathbootcamps.com/wp-content/uploads/the-pythagorean-formula.png?resize=560%2C315)</center>
<center>*In a right-angled triangle:
the square of the hypotenuse is equal to
the sum of the squares of the other two sides.*</center>
#### What Will I Learn?
This tutorial aims to:

- Solve one side of a right-angled triangle using Pythagorean Theorem in Python


#### Requirements

- Python IDLE

#### Difficulty

- Basic

#### Tutorial Contents
##### The Code:
First, we import sqrt function from math module into the current namespace.
<code>from math import sqrt</code>

Display an information about the program (may not be included).
<code>print('This is a Pythagorean Theorem calculator! Calculate one side of right-angled triangle.')
print('Assume the sides are a, b, c and c is the hypotenuse.')</code>

Second, ask the user on which side to calculate and assign it to a variable (i used variable 'choice').
<code>choice = input('Which side (a, b, c) do you want to calculate? side: ')</code>

Third, making if ... elseif condition statement.
If the user wants to find for the hypotenuse which is side c.
<code>if choice == 'c':
    a = float(input('Input the length of side a: '))
    b = float(input('Input the length of side b: '))</code>
Solving for the c with the formula: √a^2+b^2
<code>c = sqrt(a * a + b * b)</code>
Display the value of side c
<code>print('The length of side c is %g: ' %(c))</code>

Else if, the user wants to find for the  side b.
<code>elif choice == 'b':
    a = float(input('Input the length of side a: '))
    c = float(input('Input the length of side c: '))</code>
Solving for the b with the formula: √c^2-a^2
<code>b = sqrt(c * c - a * a)</code>
Display the value of side b
<code>print('The length of side b is %g: ' %(b))</code>

Else if, the user wants to find for the  side a.
<code>elif choice == 'a':
     b = float(input('Input the length of side b: '))
    c = float(input('Input the length of side c: '))</code>
Solving for the a with the formula: √c^2-b^2
<code>a = sqrt((c * c) - (b * b))</code>
Display the value of side a
<code>print('The length of side a is %g: ' %(a))</code>

Lastly, if the input is invalid.
<code>else:
    print('Invalid Input!')</code>


#### Curriculum
Please visit my previous tutorials:

- [Solving Quadratic Equation in easiest way using Python](https://steemit.com/utopian-io/@kimp0gi/solving-quadratic-equation-in-easiest-way-using-python)

<center>Thanks for reading! Hope you learn something.</center>
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