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An Equilateral Triangle

Run the program below. You will probably wonder why we turn by 120⁰...

double_arrow Execute  hourglass_top Execute

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Graphical Mode in Python

done

Console/Output

done

error_outline

clear

Mind the syntax!

DETAILS
Well... it's simple. The initial angle is 0⁰, and to get the supplement of the 60⁰ angle, we apply the geometric formula 180⁰ - 60⁰ = 120⁰:

So, after moving forward 100 pixels, we turn by 120⁰ and draw the second side. We turn again by 120⁰ and return to the starting point by moving forward 100 pixels again. Geometry is cool!

EXERCISES
Try to draw a trapezoid with the characteristics shown below:

Then, can you draw the shapes below?


Choose your own dimensions and colors!

Note, the web graphic screen is 300 pixels high, and you start from the center, so only 150 are visible upwards...

Pen Up, Pen Down!

The turtle can lift its pen so that it doesn't draw while it moves. Use the functions penup() (pen up) and pendown() (default, pen down) for this! This way, you can move around the screen...

Test the following program in the editor to understand the mechanism:

import turtle
t = turtle.Turtle()
t.forward(30)
t.penup()
t.forward(30)
t.pendown()
t.forward(30)
t.penup()
t.forward(30)
t.pendown()
t.forward(30)

Command Shortcuts

We can use fd() instead of forward(), bk() instead of backward(), as well as lt() or rt(), pu() or pd()...

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