The circle’s circumference — the measure of the total length around the shape — is determined based on the fixed ratio of Pi. In degrees, a circle is equal to 360° and Pi (p) is the fixed ratio equal to 3.14.

**Area: **p * r * r

**Perimeter: **2 * p * r

**Python Code:**

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r=float(input("Input Radius : ")) area=3.14*r*r perimeter=2*3.14*r print("Area of Circle: ",area) print("Perimeter of Circle: ",perimeter) |

This code calculates the area and perimeter of a circle given its radius.

Here’s a brief explanation of how the code works:

- The user is prompted to enter the radius of the circle.
- The “area” variable is assigned the value of the circle’s area, which is calculated using the formula “pi * r^2”.
- The “perimeter” variable is assigned the value of the circle’s perimeter, which is calculated using the formula “2 * pi * r”.
- The area and perimeter of the circle are printed to the console.

**Example 2:** With round function

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r=float(input("Input Radius : ")) area=round(3.14*r*r,2) perimeter=round(2*3.14*r,2) print("Area of Circle: ",area) print("Perimeter of Circle: ",perimeter) |

Output:

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Input Radius : 17 Area of Circle: 907.46 Perimeter of Circle: 106.76 |

This code calculates the area and perimeter of a circle given its radius and rounds the results to two decimal places.

Here’s a brief explanation of how the code works:

- The user is prompted to enter the radius of the circle.
- The “area” variable is assigned the value of the circle’s area, which is calculated using the formula “pi * r^2”. The result is then rounded to two decimal places using the “round” function.
- The “perimeter” variable is assigned the value of the circle’s perimeter, which is calculated using the formula “2 * pi * r”. The result is then rounded to two decimal places using the “round” function.
- The area and perimeter of the circle are printed to the console.

[…] Area and Perimeter of a Circle in Python […]

r=float(input(“input radius : “))

input radius=3

area=3.14*r*r

perimeter=2*3.14

print(“area of circle : “,area)

perimeter of circle=28.259999999999998

print(“perimeter of circle :”,perimeter)

perimeter of circle=56.519999999999996

plzz help,

8.A) Write a Python program to enter the radius of a circle and calculate the area of the circle.

B) Re-write the program to get the radius as a user input.