Understanding different types of angles and that angles in a triangle sum to 180° can be helpful when classifying a triangle. Recognising line symmetry and rotational symmetry will also help. Look for ...

The three angles in any triangle add up to 180°. You can use this information to find a missing angle. A scalene triangle has three different angles. To find a missing angle you need to know the other ...

Everyone learns the number one rule about triangles in high school: the angles of a triangle add up to 180 degrees. But did you know that sometimes they don't? Triangles are much more interesting than ...

to find the values of WX Y and Z when given a included triangle of another triangle there's one thing that you need to know that is the interior angle Sum Theorem basically saying that all the angles ...

The Monthly publishes articles, as well as notes and other features, about mathematics and the profession. Its readers span a broad spectrum of mathematical interests, and include professional ...