Big Idea

Discover what makes shapes similar!

Lesson Takeaways

Mathematical:

  1. Understanding how similar triangles have the same interior angles.
  2. Understanding how to determine the scale factor between similar triangles.

Introduction (5mins)

We will start by introducing 3 movement commands.

Head to https://dojo.paperland.sg/welcome.

Type your name in and hit enter.

On the left side of the screen, you will see a bunch of text.

Highlight everything and DELETE it.

image.png

On the right you will see the Command Deck.

The top 3 commands to use are the Move Forward, Face Right, and Face Left movement commands.

Either click the icons, or type out the commands in the left text editor.

fw 50

rt 30

lt 30

Edit the numbers to move forward/turn different amounts.

image.png

image.png

Now for some practise!

🎯 Task for students:

Make an equilateral triangle.

fw 100
rt 120
fw 100
rt 120
fw 100
rt 120

image.png

Activity 1: Angle Intuition (10mins)

🎯 Task for students: Everyone to make a triangle that’s not equilateral.

(as unique as possible)

image.png

🎯 Task for students: Make another two other triangles of similar shape but different sizes.

image.png

fw 50
lt 90
fw 50
lt 135
fw 70.5
lt 135

fw 100
lt 90
fw 100
lt 135
fw 141
lt 135
  
fw 200
lt 90
fw 200
lt 135
fw 282
lt 135