Snap the lines
- Draw 2 separate straight lines in a T-shape.
To learn how, visit this link: Draw a straight line - (Line Tool)
- Select the "Edit/Measure Tool" in the top toolbar.
Quick Key: Or you can press the "Q" button on your keyboard.
- (Optional - For Pro account users) In the Map View, you will see a pop-up on the left side. Select "Points".
- Seek the approximate perpendicular (90°) point by dragging an end of the second line along the first line.
When the two lines meet at the perpendicular point, a black circle will appear.
The black circle notifies you the two lines will snap together exactly where the lines are perpendicular to each other.
Snap a line’s end-point to a corner vertex of a rectangle/polygon
Snap a line’s end-point to the center of a circle
Snap a line’s end-point to the end-point on the edge of a circle