Revision sheet

All the summary cards of the chapter on one page. Print it, or save it as a PDF from the print window.

Similar figures

Lengths × $k$ , perimeters × $k$ , areas × $k^2$ .

Watch out: scale by multiplying, and square $k$ for areas.

Scale drawings

Drawing → real: multiply by the scale; real → drawing: divide.

Watch out: convert units at the end.

Scaling and area

Lengths × $k$ , areas × $k^2$ .

Watch out: scale both sides before multiplying.

CC BY-SA 4.0