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A rectangular iron sheet is 60 cm long and 4 decimeters wide. Cut off a 10 cm square from four corners and fold it into a rectangular box. How many liters is its volume If you want to put a lid on him, at least how many square centimeters of iron sheet?
4 decimeters = 40 cm
The box is long
60-10 × 2 = 40 (CM)
Box width
40-10 × 2 = 20 (CM)
What's the volume of the box
40 × 20 × 10 = 8000 (CC) = 8 (L)
If you want to put a lid on him, you need at least iron sheet
40 × 20 = 800 (square centimeter)
A rectangular iron plate, 30 cm in length and 25 cm in width. As shown in the figure, cut the square with a side length of 5 cm from four corners, and then make a box. How many ml is the volume of this box?
Because the length of the box is 30-5 × 2 = 20 (CM), the width is 25-5 × 2 = 15 (CM), and the height is 5 cm, the volume of the box is: 20 × 15 × 5, = 300 × 5, = 1500 (CC), = 1500 (ML); a: the volume of the box is 1500 ml
A rectangular iron sheet is 9cm long and 7cm wide. Cut off the four corners and make a square with a side length of 1 decimeter to make a rectangular iron box. What is the volume of this box
The length is 9-2 = 7cm
The width is 7-2 = 5cm
The height is 1cm
The volume is 7 × 5 × 1 = 35 (cm3)
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