Source: wikibot/de-gua-s-theorem
= De Gua's theorem
{wiki=De_Gua's_theorem}
De Gua's theorem is a result in geometry that relates to right tetrahedra. It states that in a right tetrahedron (a four-faced solid where one of the faces is a right triangle), the square of the area of the face opposite the right angle (the right triangle) is equal to the sum of the squares of the areas of the other three triangular faces.