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A cuboid wood is 5 meters long. After sawing it into two sections, the surface area increases by 40 square decimeters. How many cubic meters is the original volume of this wood
A cuboid wood is 5 meters long. After sawing it into two sections, the surface area increases by 40 square decimeters. How many cubic meters is the original volume of this wood
40 △ 2 = 20 square decimeters
20 * 50 = 1000 cubic decimeter = 1 cubic meter
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When a section of cuboid wood is sawn into two sections along the cross section, the surface area increases by 8 square decimeters?
The surface area is increased by 8 square decimeters by sawing into two sections along the cross section
Two cross sections are added
So the area of each cross section is 4 square decimeters
So volume = 4 × 30 = 120 cubic decimeter = 0.12 cubic meter
Saw a 2.4-meter-long cylindrical timber into four sections, and the surface area increased by 0.18 square meters. How many cubic meters is the original volume of timber?
Bottom area = 0.18 △ 4 = 0.045 M2
Volume = 0.045 × 2.4 = 0.108 M3
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