Calculate Cube Volume from 9 cm² Base Area: Step-by-Step Solution

Question

A cube has a base area of 9 cm².

Is it possible to calculate the volume of the cube? If so, what is it?

Video Solution

Solution Steps

00:00 Calculate the volume of the cube if possible
00:04 In a cube all edges are equal, let's mark it with A
00:07 We'll use the formula for calculating base area (height times length)
00:13 We'll extract the root and find the 2 possible solutions
00:17 A must be positive, as it is the length of an edge
00:21 This is the length of the edge in the cube
00:27 In a cube all edges are equal
00:31 We'll use the formula for calculating volume (edge cubed)
00:35 We'll substitute the edge value we found and solve for the volume
00:41 And this is the solution to the problem

Step-by-Step Solution

To determine if we can calculate the volume of the cube, let's start by analyzing the given information:

  1. The base area of the cube is given as 9cm29 \, \text{cm}^2. In a cube, each face is a square, so this area corresponds to the area of one face.
  2. To find the side length ss of the square face, use the formula for the area of a square: A=s2A = s^2.
  3. Set up the equation based on the given area: s2=9s^2 = 9.
  4. Solve for ss by taking the square root of both sides: s=9=3cms = \sqrt{9} = 3 \, \text{cm}.
  5. Now that we have the side length ss, calculate the volume VV of the cube using the formula for the volume of a cube: V=s3V = s^3.
  6. Substitute s=3cms = 3 \, \text{cm} into the volume formula: V=33=27cm3V = 3^3 = 27 \, \text{cm}^3.

Therefore, the volume of the cube is 27cm327 \, \text{cm}^3.

Among the given choices, the correct answer is:

  • Choice 3: 27 27

Answer

27 27