Which side is the hypotenuse?

The hypotenuse (c) is the side opposite the right angle and always the longest side.

Can I find area with this calculator?

Yes. Area = 0.5 × a × b and perimeter = a + b + c are shown.

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Pythagorean Theorem Calculator

Find any side of a right triangle using a² + b² = c².

Right Triangle Sides

Leave one field empty — that is the side that will be calculated.

Side a (leg)

Side b (leg)

Side c (hypotenuse)

Formula: a² + b² = c² (c is the hypotenuse)

Triangle Result

All three sides, area, and perimeter.

Step-by-Step

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Live result

Side a—

Side b—

Hypotenuse c—

Area—

Perimeter—

Pythagorean Theorem

Built for speed, clarity, and SEO depth.

The Pythagorean theorem states that in a right triangle, the square of the hypotenuse equals the sum of squares of the other two sides.

Pythagorean Formulas

Solving for any unknown side.

Find Hypotenuse

c = √(a² + b²)

c is always the longest side (hypotenuse).

Find a Leg

a = √(c² - b²)

Use when hypotenuse and one leg are known.

Frequently Asked Questions

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Find Hypotenuse

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Frequently Asked Questions

Which side is the hypotenuse?

Can I find area with this calculator?

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