Calculate the volume of the rectangular parallelepiped using the formula V = ABC
Calculate the volume of the rectangular parallelepiped using the formula V = ABC, if a = 4.2 dm, b = 6.5 dm, c = 0.8 dm, round the result to one.
Since the units of measurement of the sides of the parallelepiped are expressed in decimeters, that is, there is no need to equalize the values, then we substitute the values a = 4.2 (dm), b = 6.5 (dm) and c = 0.8 (dm) into the given formula : V = a * b * c = 4.2 (dm) * 6.5 (dm) * 0.8 (dm) = 21.84 (dm3).
Let’s round the result up to one.
Since the last digit is 4, the penultimate digit 8 does not change, that is: 21.84 (dm3) ≈ 21.8 (dm3). We take the next digit, the last digit is 8, which means that the penultimate digit 1 is increased by 1, that is, 1 + 1 = 2 and at the same time: 21.8 (dm3) ≈ 22 (dm3).
Answer: the volume of a parallelepiped is 22 cubic decimeters.