How this resource helps
An explicit sequence of rigid motions and one positive dilation proves similarity by mapping the whole figure. Rigid motions preserve lengths and angles; dilation preserves angles and multiplies all corresponding sides by one common factor. With corresponding angles equal and sides proportional, rigid alignment followed by that dilation maps the triangles exactly. Standard NC.M2.G-SRT.2: Understand similarity in terms of transformations. NC.M2.G-SRT.2a Determine whether two figures are similar by specifying a sequence of transformations that will transform one figure into the other. NC.M2.G-SRT.2b Use the properties of dilations to show that two triangles are similar when all corresponding pairs of sides are proportional and all corresponding pairs of angles are congruent.
What’s Included
- One editable 16:9 PowerPoint with 35 slides and teacher speaker notes on every slide.
- Full standard and all its subparts, unpacking, essential question, learning goals, warm-up, vocabulary and teaching routine.
- Five worked models, guided practice, partner work, five scored independent items, small-group intervention and an open extension.
- Matched blank/completed guided notes, a three-item exit ticket and reflection.
- Editable mathematical diagrams, tables and graphs where relevant. Graphing calculator or spreadsheet activities are included where required by the standard.
Resource details
- Grade / course
- NC Math 2
- Subject and resource type
- Mathematics · PowerPoint Lesson
- Files
- 0 main PDF pages · 35 editable slides · PPTX
- Estimated completion time
- 45–60 minute lesson
- Answer key
- Teacher answer guidance is included in the speaker notes on every slide.
Standard or objective
NC.M2.G-SRT.2 — Understand similarity in terms of transformations. NC.M2.G-SRT.2a Determine whether two figures are similar by specifying a sequence of transformations that will transform one figure into the other. NC.M2.G-SRT.2b Use the properties of dilations to show that two triangles are similar when all corresponding pairs of sides are proportional and all corresponding pairs of angles are congruent.
Understand similarity in terms of transformations. NC.M2.G-SRT.2a Determine whether two figures are similar by specifying a sequence of transformations that will transform one figure into the other. N
Original Saint Pierre Learning Resources lesson aligned to the North Carolina Standard Course of Study for NC Math 2 Mathematics.
Learner directions
Students work through each slide as the teacher directs, completing practice and exit-ticket items.
Teaching suggestions
Project each slide in order. Follow the teacher models, then guide practice as labeled on each slide.