A textbok measuring 15cm*10cm*2.5cm is to be covered with brown paper. find how much paper is required for covering the book if 84 sq.cm gets used up in folds?
please help me out.
The length, breadth and height of the textbook are 15 cm, 10 cm and 2.5 cm respectively.
The area of paper required to cover the text book = area of top and bottom face + area of side face
= (lb + lb + lh)
= 2lb + lh = (2 × 15 × 10) + (15 × 2.5) = 300 + 37.5 = 337.5
Since, of paper is used in folds,
so, the total area of paper required to cover the book = 337.5 + 84 = 421.5