# Python Circle Sector Challenge

Maths and Computer Science are often taught very separately, and yet they make excellent companions. Writing a program to explore a topic from Maths can really help to understand the topic deeply as well as providing a great opportunity to practice your coding skills.

## Python Program to Draw a Circle Sector

Here’s a challenge: use the Python Turtle Module as described here, to draw a sector of a circle given a radius and an angle. The result should look something like this:

Here’s some skeleton code to get you started:

``````import turtle

# Set up Turtle and window
turtle.setup(500, 500)  # Determine the window size
wn = turtle.Screen()  # Get a reference to the window
wn.title("Circle Sectors")  # Change the window title
wn.bgcolor("lightgreen")  # Set the background color
bob = turtle.Turtle()  # Create our favorite turtle
bob.color("hotpink")

pass

# Try out the function, giving an angle, a radius and the name of your turtle
draw_sector(40, 100, bob)

# Allow click to exit
turtle.done()
``````

You might want to check out `turtle.setheading()` and `turtle.circle()` from the docs to get some extra help.

## Solution to Python Circle Sector Challenge

Here’s a possible solution for this challenge:

There’s actually quite a bit going on in that code, and depending on your level of experience, some of it might require further exploration. Here’s a few key points:

• Creating a `turtle.Screen()` object to get access to things like `bgcolor`, `title` etc.
• Passing in a turtle as a function argument. This is often good practice as it leads to clean, well-organised code.
• `begin_fill()` and `end_fill()` are fun turtle methods to play with
• `setheading()` can you determine what system of measuring angles is used by Turtle Graphics? 90° is actually North, and rotation increases in an anti-clockwise direction.

I hope you enjoyed this challenge. Happy computing.

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