How to Measure a Roof with Google Earth
Click on the images to enlarge them.
11. Pick Your First Roof Corner
Your cursor is now a little square. Center the square on a corner of the roof and left click your mouse.
This puts a little dot on that corner of the roof.
12. Move to the Next Corner
Move to the next corner of the roof and left click.
A line should appear, connecting the two corners. (In the little measuring tools box, the distance of the line should appear.)
13. Move to the Third Corner
Click on the next corner of the roof. Now you should see a triangle formed by the three corners.