What is the sum of the interior angles of a quadrilateral?

In the USA, Grade 8 students learn that the sum of the interior angles of a quadrilateral is always 360 degrees. This fundamental concept in geometry is crucial for understanding the properties of quadrilaterals. It allows students to solve a variety of problems related to angles within quadrilaterals. Understanding this principle is essential for progressing to more advanced geometry topics. Once students grasp the concept, they can apply it to real-world scenarios and more complex mathematical problems.