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LESSON PLAN
Scale Diagrams and Similar Figures
A
Apothem Team
Grade 9 · Geometry
LESSON AT A GLANCE
Warm-up
5 min
Instruction
15 min
Guided practice
15 min
Independent work
12 min
Exit ticket
3 min
Warm-up
Activate prior knowledge with a short problem or discussion prompt connected to today’s concept.
Instruction
Guided practice
Independent work
Exit ticket
Students complete the practice set. Exit ticket: one targeted question to gauge understanding before next class.
TIP Connect new concepts explicitly to what students already know. Highlight where today’s idea extends or refines a prior one.
WORKED EXAMPLES
Example 1 — write a problem here.
Walk through the solution step by step.
Example 2 — students try with a partner.
Discuss the approach as a class.
MATERIALS
•Student notebooks
•Graphing calculators
•Practice worksheet (PDF)
•Board or projector
WATCH FOR
!Watch for confusion between related procedures from prior units.
!Students may over-apply a rule from a simpler case — name the boundary explicitly.