This is the simplest app to check the square!
To be a right triangle, it is necessary that the sum of the squares of the legs be equal to the square of the hypotenuse.
With this app you can calculate the size of one side by informing the size of the other two sides of the right triangle. Take the test with the classic example of 3, 4, 5: 3² + 4² = 5².
This app uses the Pythagorean Theorem to calculate the sides of the right triangle.