Pythagorean theorem
Grade 9
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.
- Right triangle with legs 3 and 4. Find the hypotenuse
Show answer
5 - Right triangle with legs 6 and 8. Find the hypotenuse
Show answer
10 - Right triangle: hypotenuse 5, one leg 3. Find the other leg
Show answer
4 - Right triangle: hypotenuse 10, one leg 6. Find the other leg
Show answer
8
Practise this every day
Eduyro gives your child a short daily worksheet on exactly this skill, and moves them on only once they have it. Watch the lesson, then build the fluency.
Start free