## Mathematics 9 Similarity and Transformations

**Specific Curriculum Outcomes**

**G02**

**Students will be expected to demonstrate an understanding of similarity of polygons.**

**G03**

**Students will be expected to draw and interpret scale diagrams of 2-D shapes.**

**G04**Students will be expected to demonstrate an understanding of line and rotation symmetry.

## activities

**Mini-Golf Similar Triangles from Fawn Nguyen -**The challenge then was to get the ball into the hole. Since you can’t putt the ball directly into the hole due to the water hazard, you need to make a bank shot.

**Measuring with Mirrors and Similar Triangles**- Measuring the height of a flagpole or other tall object using a mirror and similar triangles.

**Photographs Task from MAP Assessment Tasks**- In this task, you need to figure out how to fit three different-sized photographs on a single sheet.

**The Incredible Shrinking Dollar from Dan Meyer**- Dan shrinks a dollar bill on a photocopier. If Dan shrinks the dollar nine times like this, how big will it be? Will you still be able to see it?

**Big Cheques from Kyle Pearce**- Kyle walks into the photocopy room, take a cheque out of his wallet and places it on the photocopier. He then begin to press the button to enlarge the photocopy repeatedly. What’s the question that comes to mind?

**Flag Symmetry -**Can you find a country or provincial flag with line and/or rotational symmetry? Design a flag for planet Earth that has both line and rotational symmetry. Check out some suggestions for a Flag of the Earth. How about Oskar Pernefeldt's suggestion for The International Flag of Planet Earth.

**Similar but Not Congruent from Matt Enlow**- Dividing shapes into similar but not congruent pieces