Free calculator · Years 8 to 10
Enter any two sides of a right-angled triangle. You’ll get the missing side and every step of the working, set out the way your teacher wants to see it.
Got it wrong in homework?
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It uses Pythagoras' theorem, , where is the hypotenuse.
It only works for right-angled triangles. If the question involves an angle, use the trigonometry calculator instead.
Learning the method? Read Pythagoras’ theorem explained, with worked examples and practice questions.
Enter the two shorter sides and leave the hypotenuse blank. The calculator squares them, adds them and takes the square root, showing each step.
Enter the hypotenuse and the side you know, and leave the other blank. It squares the hypotenuse, subtracts the square of the known side and takes the square root.
The hypotenuse is opposite the right angle and is always the longest side. If the number you entered as the hypotenuse is shorter than another side, it's probably in the wrong box.
If the answer is a whole number it shows it exactly. Otherwise it shows the exact square root and the answer rounded to 2 decimal places, which is what most questions ask for.
Tuterly · Years 7 to 10 maths
Tuterly saves the questions you get wrong, shows the working, and gives fresh questions on the same skill until it’s mastered.
Coming soon on iPhone. Android soon after.