Lesson objective: Apply scale factors to dimensions, perimeter and area.
This lesson provides an opportunity for students to apply their knowledge and understanding of scale drawings to a reallife situation. Students are asked to reason about mathematical statements dealing with the relationship between scaled figures.
Key Concept students will use:

Scale drawings may be larger, smaller, or the same size as an original drawing.

Lengths of sides of pairs of scale drawings are proportional, resulting in proportional perimeters.
 Areas of pairs of scaled figures are related by the square of the scale factor.
Skills students will use:
 Calculate dimensions of a scaled figure.
 Calculate perimeter of a scaled figure using the scale factor and the perimeter of the original.
 Calculate area of a scaled figure by finding the product of the square of the scale factor and the original area.
Students engage in Mathematical Practice 3 (Construct viable arguments and critique the reasoning of others) as they explain why Diego's statements are or are not correct and justify their corrections.
Key vocabulary:
 Exponents
 Original figure
 Powers
 Proportions
 Ratios
 Scale drawings
 Scale factor