1. Similar triangles: Missing sides with other triangles
Silent
Teacher
Intelligent Practice
Narration
Your Turn
Practice

2. Similar triangles within other shapes
Triangles not drawn to scale
Example
Your turn
8mm 6m 6m x x2
4mm
5mm 3m
7.5m
8mm x x2
7.5x2 = 15m
5x2 = 10cm

3. Intelligent Practice – Find the length of every missing side
Triangles not drawn to scale
12mm
20mm x 1. 2. 3.
10mm x
6mm
12mm 4.

4. Intelligent Practice – Find the length of every missing side
Triangles not drawn to scale 5. 6. x
6mm
12mm
3mm
8mm

5. Practice – Find the length of every missing side
Triangles not drawn to scale
12mm
20mm x 1. 2. x3
5x3=15mm x4
4x4=16mm 3.
10mm x
6mm
12mm 4. x3
6÷3=2mm x2
6÷2=3mm

6. Practice – Find the length of every missing side
Triangles not drawn to scale 5. 6.
x1.5
6÷1.5=4mm x
6mm
12mm
3mm
8mm
x1.5
6÷1.5=4mm
8x1.5=12mm
12-8 = 4mm