Right Triangles, Hypotenuse, Pythagorean Theorem

Right Triangle Calculator -Online tool to find measure of sides and angles of a right triangle. Also draws a downloadable picture of triangle based on your input.

Related: right triangle | proof of the pythagorean theorem | Hypotenuse of a right triangle | Special Right Triangles | Images of right Triangles

A right triangle has one 90° angle (angle B in the picture on the left) and a variety of often-studied formulas such as:

The Pythagorean Theorem
Trigonometry Ratios(SOHCAHTOA)
Pythagorean theorem vs sohcahatoa (which to use)

A Right Triangle's Hypotenuse

The hypotenuse is the largest side in a right triangle and is always opposite the right angle. (Only right triangles have a hypotenuse). The other two sides of the triangle, AC and CB are referred to as the 'legs'.

In the triangle on the left, the hypotenuse is the side AB which is opposite the right angle,

Hypotenuse Calculator

Online tool calcualtes the hypotenuse ( or a leg) using the pythagorean theorem. (Also draws a free downloadable picture of your right Triangle!)

The pythagorean theorem : the sum of the squares of the lengths of the legs equals the square of the length of the hypotenuse.

In the right triangle on the left, the pythagoran theorems' formula is

A²+ B²= C²

The Pythagorean Theorem Practice Problems

Below are several practice problems involvin the pythagorean theorem, you can also get more detailed lesson on how to use the pythagorean theorem here.