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A rectangular sheet of iron, 30cm long and 25cm wide, cut a 5cm square from each of the four corners, and then made into a box. How many sheets of iron do you use?
A rectangular sheet of iron, 30cm long and 25cm wide, cut a 5cm square from each of the four corners, and then made into a box. How many sheets of iron do you use?
30×25-5×5×4
=750-100
=650 square centimeters
73. A rectangular iron sheet is 30cm long and 25cm wide. A 5cm long square is cut from each corner, and then it is made into a box without a cover
The long side of the box is 20 cm, the width is 15 cm, the height is 5 cm, and the volume is v = 20 * 15 * 5 = 1500 cubic cm
The outer surface area of the box is s = 2 * 15 * 5 + 2 * 20 * 5 + 15 * 20 = 700 square centimeters
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