[IGCS] For-loop with tutle

Presentation

•

Social Studies, Computers

•

9th Grade

•

Practice Problem

•

Hard

Andy tsui

Used 6+ times

FREE Resource

11 Slides • 2 Questions

[IGCS] For-loop with tutle

Introducing Turtle graphics

In REPL.it, start a new "Python with Turtle" project
Name it with "for-loop-with-turtle"
On the first two line, do:

Enter the following in your new REPL

import turtle

t = turtle.Turtle()

Run, and on the command console, try:

t.forward(50)
t.left(50)
Note what are they doing? and can you guess how to go backward and rotate right?

Drawing regular shapes

Try to draw a square

Fill in the Blanks

Type answer...

Now try to draw the square with For-loop

Multiple Choice

Now we try to draw equilateral triangle, we need to repeat 3 times the following:

t.forward(50)

t.right([X])

What is X?

120

150

120 is the exterior angle

Can you recall the formula for it?

Exterior angle of n-side polygon

ext_angle = 360 / n

Practice time, using for loops to:

Draw a Pentagon of each side 20 unit long
Draw a Hexagon of 20 unit long
Draw an Octagon of 20 unit long
Draw a Decagon of 20 unit long

Finding the pattern

In a regular polygon:

for i in range (n):

⠀t.forward(20)

⠀t.right(?)

Summary

For loop is for counting and the counter can be used as a variable

It is usually not advisable to change the counter value inside the loop

[IGCS] For-loop with tutle

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