Pythagorean theorem

What this lesson shows

A right triangle. One leg is 3, the other is 4. How long is the slanted side… without measuring it?

Try it yourself

Real questions from this lesson's worksheets — answers below each one.

1. Right triangle with legs 3 and 4. Find the hypotenuse
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   5
2. Right triangle with legs 6 and 8. Find the hypotenuse
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   10
3. A ladder's foot stands 3 m from a wall and its top reaches 4 m up the wall. How long is the ladder (m)?
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   5
4. A ladder's foot stands 6 m from a wall and its top reaches 8 m up the wall. How long is the ladder (m)?
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   10