Math Makes Sense 8 · Unit 4
Fold a flat net into the solid and watch each face carry its own area into the formula. Every number updates as you change the dimensions.
Lessons 4.1–4.8 cover these three.
Slide from flat net to finished solid. The faces never change size — that is the whole point of a net.
Measurements are in centimetres.
Tap a row to pick that face out of the drawing.
| Face | How its area is found | Area |
|---|
The surface area of an object is the sum of the areas of its faces.