ELI5: Explain Like I'm 5

Intersection theorem

Imagine you have two circles, one big and one small, and they are overlapping in certain areas. If you draw a straight line through those overlapping areas, you will see that the line intersects both circles.

Now, the intersection theorem is a fancy way of saying that if you have two different shapes like circles, triangles, or squares, and they overlap in a certain area or share some points, then any line, line segment, or ray that passes through that overlapping or shared point(s) will intersect both shapes.

So why is this important? It helps us understand the relationship between different geometrical shapes and how they interact with each other. This theorem is useful in a lot of real-life situations, such as in architecture or engineering when designing structures with different shapes, or in navigation when trying to determine the position of one object relative to another.

In conclusion, the intersection theorem is a rule that tells us that any line that passes through the overlapping or shared points of two shapes will intersect both shapes.