ACT Preparation / Unit 13 ACT 1223 short lesson, about 20 seconds
Pythagorean Triples
Captions available
The idea
A Pythagorean triple is three whole numbers that fit a² + b² = c². Two that appear often are 3, 4, 5 and 5, 12, 13, along with their multiples.
In practice
9, 12, 15 is 3, 4, 5 times 3; 10, 24, 26 is 5, 12, 13 times 2.
Where people slip
Recognizing a triple saves the arithmetic.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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