Place the ruler side by side with the object. One of the edges of the object should be in the "0" value of the ruler. Then just see where the other edge is and there you have it.
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You could align the edge of the object with the zero on the ruler and then read off the marking on the ruler which aligned with the other end of the object.
a ruler is used to measure it and cm, sometimes inches to
you need an object to measure to determine the nearest inch
You can measure the length of an object or the distance between two objects.
if your question is explain how to use a ruler to measure to the nearest inch the answer would be...you have to see what inch is the object your measuring to closest to