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(Click on the images to enlarge.)

9. Now to start measuring. At the top left, click on “Tools”. In the drop-down menu, check the box next to “Ruler”. This opens a box with a little menu across the top. Click on “Polygon”. The default unit of measurement should be “feet” and “square feet”. If it isn’t, or if it is but you want a different unit, you can change it by clicking on the little unit fields there. (You probably shouldn’t use “Smoots” as your unit of measurement; few people have ever achieved such a high level of measurement expertise.)

10. Put your cursor in the top area of the little box, hold down the left mouse button, and drag it out of the image field. Do not close the ruler box.