Measure the length and the width. Or if you are feeling particularly energetic, then one of them and the diagonal.
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The lengths of the base and the side. You would multiply these to get the area and would double sum of the two to obtain the perimeter measurement.
2*(base) + 2*(height) = perimeter
Take the measurement of one side of the square and multiply it by 4.
If the perimeter of a shape is 78, it means the sum of all its sides is 78 units. To find the measurement of each side, you would need to know the number of sides the shape has. For example, if it is a rectangle with two equal sides and two other sides of different lengths, the measurement of each side would be 78 divided by 2, which is 39 units.
Units of weight or mass for a book would be in pounds and ounces or grams and kilograms.