Show that this triangle is Isosceles (OR equilateral OR scalene)

Описание к видео Show that this triangle is Isosceles (OR equilateral OR scalene)

To show what type of triangle you have, you need to calculate 3 side lengths.
The Length formula is easy once you're used to it:
L = sqrt[ (x2 - x1)^2 + (y2 - y1)^2 ]
Do this three times for each pair of points, and if:
All the lengths are the same ... equilateral
Exactly two lengths are the same ... isosceles
None of the lengths are the same ... scalene

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