PPT lesson summary · Foundation PPT · CIE Core
Similar Shapes PPT lesson summary
Similar Shapes PPT lesson — Foundation (CIE Core). These slides walk a lower-secondary class through the key ideas with diagrams and worked examples on screen. This page summarises the teaching points for search and revision; download the PowerPoint for the full lesson, and use the companion worksheet and answers PDFs for independent practice.
Files: foundation-slides-01M65P9H6B4BN23349EYH0DBPR.pptx · foundation-14 Similar Shapes handout.pdf · foundation-14 Similar Shapes handout answers.pdf · free public downloads · diagrams on the slides
Key learning points
- Matching angles are equal; corresponding sides share one scale factor .
- Find by dividing a known image side by the matching object side.
- Missing length = matching length × scale factor (or ÷ if going the other way).
- Similar does not mean congruent — sizes may differ.
Worked example 1 — Missing side
Scale factor ; short side . Matching side?
Working
Multiply corresponding lengths.
Worked example 2 — Area scale factor
Length scale factor . Area SF?
Working
Square the length SF.
Worked example 3 — Volume scale factor
Length scale factor . Volume SF?
Working
Cube the length SF.
Full slides and practice PDFs
This page is a short, searchable overview of the PPT lesson for revision and search engines. Download the PowerPoint for classroom teaching, then use the companion worksheet and answers when available.