ELI5: Explain Like I'm 5

Euclidean geometry

Euclidean geometry is all about shapes and space. Imagine you have a big piece of paper and you draw some shapes on it like squares, rectangles, circles, and triangles. Euclidean geometry is the study of how these shapes fit together and how we can measure their size and distance.

One of the most important things in Euclidean geometry is the concept of a straight line. It's like a line that never curves or bends. We use these straight lines to create all sorts of shapes and figure out how they fit together.

Another big part of Euclidean geometry is measuring angles. An angle is like a corner or a turn in a shape. The amount of turning that happens is called the angle measure. You can use a protractor (which is like a special tool you can use to measure angles) to figure out how big different angles are.

Finally, we use Euclidean geometry to explore the relationships between different shapes. For example, we might want to know how to find the area or perimeter of a shape, or how to figure out how far apart two points are.

So in short, Euclidean geometry is all about figuring out how different shapes and spaces fit together and how we can measure them. It's like playing with puzzles and trying to find out how all the pieces go together.