Isosceles triangle is acute, right or obtuse depends only on the angle at its apex. In Euclidean geometry, the base angles cannot be obtuse (greater than 90°) or right (equal to 90°) because their measures would sum to at least 180°, the total of all angles in any Euclidean triangle. Since a triangle is obtuse or right if and only if one of its angles is obtuse or right, respectively, an isosceles triangle is obtuse, right or acute if and only if its apex angle is respectively obtuse, right or acute. In Edwin Abbott's book "Flatland", this classification of shapes was used
Many-angled ones not be many-angled ones. It is specifically stated – on multiple occasions – that "the many-angled ones live at the bottom of the Mandelbrot set". The beings were referenced in the DC comic book "Hitman", by Garth Ennis, which briefly featured demons called "The Multi-Angled Ones" who end up killing most of Section 8. They also appear in Simon R. Green's Secret History series of books "The Man with the Golden Torc" (2007), "Daemons Are Forever" (2008), and "The Spy Who Haunted Me" (2009). In the Marvel Comics cosmic crossover event "Realm of Kings," written by Dan Abnett and Andy