When geometric elements are coincident, it means they are overlapping. You can use the Coincident constraint to make sketch endpoints coincident with other elements to make them connected.
To create a Coincident constraint:
- Select an endpoint.
- Select another element.
- Select Coincident from the constraints menu or drag an endpoint onto the element you want to connect to.
Note: Endpoints can be made Coincident to other endpoints, lines, curves, and edges.
Learn more by watching the video below: