Calculate perimeter, hypotenuse, and diagonal length for triangles, circles, and rectangles.
How to calculate perimeter, hypotenuse, and diagonal
This tool doesn't calculate area — it calculates length-based measurements: perimeter, hypotenuse, and diagonal. Triangle: Enter two legs (a, b) to get the hypotenuse via the Pythagorean theorem (c = √(a²+b²)) and the perimeter (a+b+c). Enter all three sides to get just the perimeter (a+b+c). Circle: Enter the radius to calculate its circumference (Circumference = 2πr). Rectangle: Enter width and height to calculate the perimeter (2×(width+height)) and diagonal length (√(width²+height²)). Looking for area instead? Try our Area Calculator.
Common questions about length calculation
In a right triangle, a² + b² = c². a and b are the two legs, and c is the hypotenuse (the longest side, opposite the right angle).
Other useful tools related to mathematical calculations
How to calculate perimeter, hypotenuse, and diagonal
This tool doesn't calculate area — it calculates length-based measurements: perimeter, hypotenuse, and diagonal. Triangle: Enter two legs (a, b) to get the hypotenuse via the Pythagorean theorem (c = √(a²+b²)) and the perimeter (a+b+c). Enter all three sides to get just the perimeter (a+b+c). Circle: Enter the radius to calculate its circumference (Circumference = 2πr). Rectangle: Enter width and height to calculate the perimeter (2×(width+height)) and diagonal length (√(width²+height²)). Looking for area instead? Try our Area Calculator.
Common questions about length calculation
In a right triangle, a² + b² = c². a and b are the two legs, and c is the hypotenuse (the longest side, opposite the right angle).