Homework Help: Calculus and vectors-Help~David

Posted by Jake on Thursday, March 22, 2012 at 11:25pm.

Rectangular prism is defined by vectors (2,0,0)(0,9,5) and (0,0,3). Find the volume.

I have done this so far, would anyone please verify this.

(2,0,0)(0,9,6)

(0-2, 9-0, 6-0)
=(-2,9,6)

(-2,9,6)(0,0,3)

=(2,-9,-3)

(2)(-9)(-3)=54 cm^3

Therefore volume is 54 cm^3

Calculus and vectors-Help~David - Reiny, Friday, March 23, 2012 at 12:04am
54 cm^3 is the correct answer

I do it differently:
if given 3 vectors a, b, and c
volume of parallelepiped
=| a . (b X c) |

(2,0,0) X (0,0,3) = (0, -6, 0)

volume = |(0,9,5) . (0,-6,0) |
= |0-54+0| = 54
Calculus and vectors-Help~David - Jake, Friday, March 23, 2012 at 12:09am
Thank you very much!

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