It is a method to instantly derive semi-famous angles from the two right-angled triangles used in elementary school. I constructed it like a simple puzzle by just overlapping the two triangular rulers ...

- Draw the bisector of the interior angle and the bisector of the exterior angle at D - Let F and G be the points where these bisectors intersect AB and its extension, respectively. B is the point ...

Learn about the Pythagorean theorem. The Pythagoras theorem is a fundamental relation among the three sides of a right ...