# Intersection

The place where two streets or lines cross eachother.

## Meaning

The point at which two lines (or curves) touch, even if the lines/curves do not cross each other, is called their intersection. The lines (or curves) are said to **intersect** at that point. So, the corner of a rectangle is a point of intersection of two of the sides. Intersecting lines are lines that share a point in common (or, less commonly described as "intersecting," coincide entirely).

## Mathematical background

See multiplication for more about how the **intersection** model is used in *Think Math!* along with the area model.

Vedic mathematics, from India, uses an intersection model for multi-digit multiplication. See video on Vedic multiplication.

## What's in a word?

inter- (between or among, mutually or together) + -sect (cut) = "mutually cutting"; two roads "cut" (across) each other at their intersection.