ACT Preparation / Unit 13 ACT 1228 short lesson, about 20 seconds
Scale Factor for Area and Volume
Captions available
The idea
When every length of a figure is multiplied by a scale factor k, its areas are multiplied by k² and its volumes by k³.
In practice
Doubling every edge of a box multiplies its surface area by 4 and its volume by 8.
Where people slip
The course derives this from the area and volume formulas: each length factor carries its own k.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
Unlocks
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