When two straight lines are perpendicular to each other, it means that the angle between them is 90 degrees. In Euclidean geometry, any two straight lines are either parallel, intersect at a point or intersect.

For two perpendicular lines, they are neither parallel nor intersecting, so they must intersect at one point. This intersection can occur anywhere on the plane or anywhere in the three-dimensional space. However, this intersection is unique, because if two straight lines intersect at two different points, they will not be perpendicular.

It is a basic fact in geometry that two vertical straight lines must intersect at a certain point. We can also consider this problem from the angle of algebra.

If two straight lines are perpendicular, their slopes must satisfy a certain relationship. On the two-dimensional plane, if the product of slopes of two straight lines is-1, then the two straight lines are perpendicular. This means that the sum of the slopes of these two lines is zero, so they must intersect.

Methods of learning primary school mathematics well;

1, understand and master the basic concepts:

Learning mathematics needs to understand and master the basic concepts first, because these concepts are the basis of constructing mathematical theory. In order to better understand and remember basic concepts, students can adopt the following methods: accurately understand the connotation and extension of concepts; We should compare the differences and connections between similar concepts to avoid confusion; We should link concepts with real life and deepen our understanding through examples.

2, cultivate mathematical thinking ability:

Mathematical thinking ability includes logical reasoning, inductive classification and reduction. These abilities are crucial to solving mathematical problems. To cultivate mathematical thinking ability, we need to gradually accumulate experience and master methods in the process of learning mathematics. Students also need to improve their thinking level through practice and reflection.

3, pay attention to practice and application:

Mathematics is a practical subject. Learning mathematics is not only to cope with exams, but also to solve practical problems. Students need to pay attention to practice and application. In the learning process, students can improve their mathematics application ability by solving some practical problems. Students can also exercise their mathematical practical ability by participating in activities such as mathematical competitions.

When two straight lines are perpendicular to each other, it means that the angle between them is 90 degrees. In Euclidean geometry, any two straight lines are either parallel, intersect at a point or intersect. For two perpendicular lines, they are neither parallel nor intersecting, so they must intersect at one point. This intersection can occur anywhere on the plane or anywhere in the three-dimensional space. However, this intersection is unique, because if two straight lines intersect at two different points, they will not be perpendicular.

It is a basic fact in geometry that two vertical straight lines must intersect at a certain point. We can also consider this problem from the angle of algebra. If two straight lines are perpendicular, their slopes must satisfy a certain relationship. On the two-dimensional plane, if the product of slopes of two straight lines is-1, then the two straight lines are perpendicular. This means that the sum of the slopes of these two lines is zero, so they must intersect.