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Pythagorean Theorem Calculator

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STUDENT
TEACHER

Pythagorean Theorem Calculator

The Pythagorean Theorem

CALCULATOR
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Pythagorean Theorem Calculator

Step 1. Identify the given and missing sides.

The small square inside the triangle points toward the hypotenuse (the longest side). The legs are the sides that form the right angle and L shape of the triangle.
Given Values:Missing:
Please enter your given values.

Step 3. Use Pythagorean's Theorem to find the missing side.

Pythagorean's Theorem tells us the areas of the smaller two squares combined are equal to the area of the largest square. We can use this to find the missing side:
Nice! The hypotenuse of the triangle is .
We have some questions for you! Help us out through this
INTRO
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It might seem like Pythagorean Theorem is all about right triangles, but if we dig deeper it's also about squares.That's right! Let’s say we have a right triangle with sides , , and .
In a right triangle, the mini square 🔲 marks the right angle. Sides and form an L around the right angle and are called the legs.
The small square inside the triangle always points towards , the longest side of the triangle, also called the hypotenuse.
The Pythagorean Theorem tells us that if squares are formed on each of the three sides, the sum of the areas of the two smaller squares is equal to the area of the biggest square.
We can use this concept to find any missing side of a right triangle given the two other sides.
Check out our
Calculator
or explore our
Lesson
and
Practice
sections to learn more about the Pythagorean Theorem and test your understanding.

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KEY STEPS
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How to Use the Pythagorean Theorem

Step 1. Identify the given and missing sides.

The small square inside the triangle points toward the hypotenuse (the longest side). The legs are the sides that form the right angle and L shape of the triangle.

Step 2. Imagine a square on each of the three sides of the triangle.

Step 3. Use Pythagorean's Theorem to find the missing side.

Pythagorean's Theorem tells us the areas of the smaller two squares combined are equal to the area of the largest square. We can use this to find the missing side:
LESSON
— Pythagorean Theorem
PRACTICE
— Pythagorean Theorem
CONCLUSION
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