Python 30 Days Challenge: Day 1 - Area of a Circle - Code With Drew
Hey there 👋
Welcome to Day 1 of my Python 30 Days Coding Challenge!
In today’s challenge, we’re starting with something simple yet powerful — calculating the area of a circle in Python. It’s a great warm-up to help beginners understand variables, mathematical formulas, and input/output in Python.
🎥 Watch the full video here:
🧩 What You’ll Learn Today
How to take user input in Python
How to use the math module
How to perform basic arithmetic operations
How to print formatted results
💡Python Challenge Problem Description
Write a Python program to find the area of a circle given its radius.
📝 Input Format
You’ll receive a single floating-point number — the radius of the circle.
📤 Output Format
Your program should print a message showing the area of the circle.
🧠 Thinking Process
Before jumping into the code, let’s break it down step-by-step:
Recall the formula:
A=πr2A = πr^2A=πr2
where AAA is the area and rrr is the radius.
Take input from the user — we’ll convert it to a float to allow decimal values.
Use the built-in
math.piconstant for better precision.Calculate the area and round it to 2 decimal places.
Display the result clearly.
🐍 Python Code
Here’s the full code we used in the video:
import math
radius = float(input("Enter the radius of the circle: "))
area = math.pi * (radius ** 2)
print(f"The area of the circle with radius {radius} is {area:.2f}")
🧮 Code Example Run
Input:
5
Output:
The area of the circle with radius 5.0 is 78.54
Pretty neat, right? 🔥
Python makes calculations like this super straightforward once you understand the syntax.
💬 Python Challenge Extra Tip
You can simplify your output even more by using Python’s built-in round() function:
print("Area:", round(area, 2))
Both methods work — it’s all about your preferred style!
🌱 Reflection
Day 1 might seem easy, but it’s an important foundation. You’ve just learned how to:
✅ Take user input
✅ Perform mathematical operations
✅ Use the math library
✅ Format outputs for readability
These skills will come in handy throughout the rest of this challenge.
🚀 Your Turn
Try modifying the code to find the circumference of the circle, or even ask the user for multiple radii in one run. Play around — that’s how you’ll truly learn!
🙌 Final Thoughts
If you found this tutorial helpful, check out the full video on YouTube above.
Don’t forget to subscribe to my channel for more daily Python challenges — we’re just getting started! 💪
See you in Day 2 of the Python 30 Days Coding Challenge 🎯
