Whole Class Example

What letters corresponds to the line AC?
What point corresponds to the point B?
What angle corresponds to the

What is scale factor?

• To create a scaled copy, we multiply all the lengths in the original figure by the same number. 

• The number you multiply by is the scale factor

• You can find the scale factor by using ratios

• The scale factor is the ratio of corresponding side lengths

Scale Factor Whole Class Example 

• What is the scale factor from shape A to shape B?

• Find the corresponding sides

• Scale factor = new/original

• Reduce

Whole Class Example: Finding Scale Factor and Missing Number 

• locate corresponding side lengths

• look for relationships between their numbers

• How many centimeters is the side length GF?

• What is the scale factor?