Lecture 5 — Turtle Circles, Arcs & Polygons
Lecture 5 — Turtle Circles, Arcs & Polygons⌗
Instructor: Laksh Budhrani
Review / Recap⌗
Commands You Already Know⌗
| Command | Meaning (Simple) |
|---|---|
p.forward(steps) | Move the turtle straight ahead |
p.backward(steps) | Move the turtle straight backward |
p.left(angle) | Turn the turtle left |
p.right(angle) | Turn the turtle right |
p.penup() | Move without drawing |
p.pendown() | Start drawing again |
p.pencolor(color) | Change the pen color |
p.pensize(size) | Change the line thickness |
p.hideturtle() | Hide the turtle icon |
p.showturtle() | Show the turtle icon again |
p.goto(x, y) | Teleport the turtle to a coordinate |
p.setheading(angle) | Point the turtle in a specific direction |
Objectives⌗
- Learn how to draw circles
- Learn how to draw arcs
- Learn how to draw polygon‑style circles
Objective 1 — Full Circle: circle(r)⌗
Simple Definition⌗
circle(r)— Draw a full circle with radius r.
Example⌗
p.circle(80)
Objective 2 — Arc: circle(r, a)⌗
Simple Definition⌗
circle(r, a)— Draw an arc of angle a degrees.
Example⌗
p.circle(100, 180)
Objective 3 — Polygon Circle: circle(r, a, s)⌗
Simple Definition⌗
circle(r, a, s)— Draw a circle or arc using s straight-line steps, creating a polygon.
Example⌗
p.circle(60, 360, 6)
Quick MCQ Check — Circle Syntax & Logic⌗
1. What does p.circle(50) draw?⌗
A. A square
B. A full circle of radius 50
C. A half circle
D. A polygon
2. What does p.circle(80, 90) draw?⌗
A. A full circle
B. A 90‑degree arc
C. A polygon
D. A straight line
3. What does the third parameter in circle(r, a, s) control?⌗
A. Color
B. Speed
C. Number of straight‑line steps
D. Radius
4. Which command draws a triangle using circle syntax?⌗
A. p.circle(50, 360, 3)
B. p.circle(50)
C. p.circle(50, 180)
D. p.circle(50, 360, 10)
5. What does p.circle(30, 180) draw?⌗
A. A full circle
B. A 180‑degree arc
C. A square
D. A hexagon
6. Which one draws a polygon with 8 sides?⌗
A. p.circle(60, 360, 8)
B. p.circle(60, 180, 8)
C. p.circle(60)
D. p.circle(60, 360)
7. What happens if you write p.circle(100, 360, 4)?⌗
A. A perfect circle
B. A square
C. A triangle
D. A straight line
8. Which command draws a quarter circle?⌗
A. p.circle(80, 360)
B. p.circle(80, 90)
C. p.circle(80, 180)
D. p.circle(80, 45, 4)
Car Drawing Activity (Guided)⌗
Create a new Python file in VS Code named:turtle_class5.py
Car Image⌗
Explain in Plain English⌗
Write a short explanation (3–5 sentences) describing how you think we can draw this car using:
circle()circle(r, a)circle(r, a, s)pencolor()pensize()goto()setheading()penup()pendown()hideturtle()
Explain the steps in simple English, as if you are telling a friend how to draw it.
Boilerplate Code⌗
import turtle as trtl
p = trtl.Turtle()
p.speed(0)
# --- ENTER YOUR CODE HERE ---
# (Use circles, arcs, and polygon circles to draw the car)
# --------------------------------------------------------------
# (Stop writing code above this line)
wn = trtl.Screen()
wn.mainloop()
Notes⌗
- Use polygon circles for the car body.
- Use full circles for wheels.
- Use arcs for the headlight.
- Use
goto()to place each part correctly. - Use
hideturtle()at the end for a clean final look.
Independent Activity — Smiley Face Drawing⌗
Smiley Face Image⌗
Your Task⌗
Look at the image above and draw it independently using:
circle(r)circle(r, a)pencolor()pensize()goto(x, y)penup()pendown()hideturtle()
Use the Turtle boilerplate code provided earlier in this lecture.
Create Your Own File⌗
Create a new Python file in VS Code named:
turtle_class5_independent.py
Inside that file, use the boilerplate and write your smiley‑face code in the section marked:
# --- ENTER YOUR CODE HERE ---
Submission Instructions⌗
Submit your work in Google Classroom by:
- Creating a Google Doc
- Pasting your code into the document
- Adding a screenshot of the output window showing your drawing
- Turn in the Google Doc to the assignment titled In‑Class Exercise 5