Final answer:
To measure the length and width of the book, use centimeters as the unit of measurement. Then use the correct number of significant digits to calculate the perimeter and area.
Step-by-step explanation:
In order to measure the length and width of the book, you should use centimeters as the unit of measurement. Centimeters are appropriate for objects of this size and are more accurate than millimeters for this purpose.
To measure the length and width of the book, align the edge of the ruler with one side of the book and record the measurement to the nearest tenth of a centimeter. Repeat this process for the other side.
Once you have measured the length and width, you can use the correct number of significant digits to calculate the perimeter and area. The perimeter is calculated by adding together the lengths of all four sides, and the area is calculated by multiplying the length and width.
Learn more about measuring the length and width of an object