Python Code Example: Circumference and circular area
The user is first prompted to enter a radius. Then the circumference and the area of the circle are calculated, rounded and output on the screen.
Code Explanation
| Line | Description |
|---|---|
| 1 | Import the math module to access the mathematical functions and numbers, in this case the number PI |
| 3 | Prompts the user to enter a radius as an integer value. The value is stored in the variable named r |
| 5 | Calculates the circumference of the circle with the formula 2 * math.pi * r. The number PI can be retrieved via the math module. The result of this calculation is stored in the variable circumference |
| 7 | Calculates the circular area of the circle with the formula math.pi * pow(r, 2). The pow() function calculates the power of a number by raising the first argument to the second argument. The result of this calculation is stored in the variable area |
| 9 | Outputs the circumference rounded to 2 decimal places |
| 10 | Outputs the circular area rounded to 2 decimal places |
import math
r = int(input("Please enter radius: "))
circumference = 2 * math.pi * r
area = math.pi * pow(r, 2)
print("Circumference: " + repr(round(circumference, 2)))
print("Circular Area: " + repr(round(area, 2)))Output
Please enter radius: 5
Circumference: 31.42
Circular Area: 78.54