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(Click on the images to enlarge.)

11. 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 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. Click on the next corner of the roof. Now you should see a triangle formed by the three corners.