College Algebra / Unit 3 Alg 126 short lesson, about 20 seconds
The Distance Formula
Captions available
The idea
The distance formula measures between two points by the Pythagorean theorem: d = √((x₂ − x₁)² + (y₂ − y₁)²).
In practice
From (1, 2) to (4, 6): the legs are 3 and 4, so d = √(9 + 16) = √25 = 5.
Where people slip
The radical covers the whole sum.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
- Nothing. This is a starting point.
Unlocks
- Nothing yet depends on this.
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