Final answer:
The area of the book is found by multiplying the length and the breadth. So, 18 cm multiplied by 12 cm equals to 216 cm².
Step-by-step explanation:
The area of an object is calculated by multiplying the length and the width (or breadth) of the object. In this case, we are asked to find the area of a book. The length is given as 18cm, and the breadth is given as 12cm.
Using the formula for the area of a rectangle, which is length x breadth, the area of the book is:
18 cm x 12 cm = 216 cm²
Learn more about Area of a Rectangle