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A 3.5 decimeter long cuboid wood is sawn into 6 sections on average, and the surface area is increased by 125 square centimeters. The volume of this section of wood is calculated
Saw into 6 sections, the number of additional cross sections is
(6-1) × 2 = 10
What is the cross-sectional area of wood
125 △ 10 = 12.5 (cm2)
3.5 decimeters = 35 cm
What is the volume of wood
12.5 × 35 = 437.5 (cm3)
Saw a 20 decimeter long cuboid wood into three sections on average, the surface area increased by 28 square decimeters, what was the volume of the original cuboid wood
28 ÷ (2 × 2) × 20 = 140 cubic decimeter
A: the volume of this cuboid wood is 140 cubic decimeters
The average surface area of this section is 3.5 cm longer than that of the original one
Good answer, plus 50!
Taking 3.5 decimeters as height, after sawing into 6 sections, the bottom area increases by 10,
So each bottom area = 125 △ 10 = 12.5 square centimeters
So the cuboid volume v = 12.5 × 3.5 × 10 = 437.5 cubic centimeter
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