ACT Preparation / Unit 13 ACT 1222 short lesson, about 20 seconds
The Pythagorean Theorem and Its Converse
Captions available
The idea
In a right triangle with legs a and b and hypotenuse c, a² + b² = c². Conversely, if a² + b² = c², the triangle is right.
In practice
Legs 6 and 8 give c² = 36 + 64 = 100, so c = 10.
Where people slip
The hypotenuse, opposite the right angle, is the longest side and stands alone as c.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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