Ontario · Grade 7
G7.E1.3
Grade 7 — Perform dilations and describe the similarity between the image and the original shape.
The skill that covers it
What a student should be able to do
- Identify similar triangles from angle relationships.
- Write and solve a proportion between corresponding sides, including the side-splitter, midsegment and angle-bisector theorems.
- Use a scale factor to find perimeters and areas.
- Solve indirect measurement problems such as shadow heights.