HSC Science (General) 12th Board ExamMaharashtra State Board
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# if A, B, C, D are (1, i, I), (2, l ,3), (3; 2, 2) and (3, 3, 4) respetivly., then find the volume of the parallepiped with AB, AC and AD as concurrent edges - HSC Science (General) 12th Board Exam - Mathematics and Statistics

#### Question

if A, B, C, D are (1, i, I), (2, l ,3), (3; 2, 2) and (3, 3, 4) respetivly., then find the volume of the parallepiped with AB, AC and AD as concurrent edges

#### Solution

Let bara, barb, barc , bard be the position vectors of points A(1,1,1),B(2,1,3),C(3, 2, 2) and D(3,3, 4)

bar a=hati+hatj+hatk

barb=2hati+hatj+3hatk

barc=3hati+2hatj+2hatk

bard=3 hati+3hatj+4hatk

Given that vectors bar(AB), bar(AC) and bar(AD) represent the concurrent edges of a palallelopiped ABCD.

bar(AB)=barb-bara=2hati+hatj+3hatk-hati-hatj-hatk=hati+2hatk

bar(AC)=barc-bara=3hati+2hatj+2hatk-hati-hatj-hatk=2hati+hatj+hatk

bar(AD)=bard-bara=3hati+3hatj+4hatk-hati-hatj-hatk=2hati+2hatj+3hatk

Consider,bar(AB).(bar(AC)xxbar(AD))=|[1,0,2],[2,1,1],[2,2,3]|

=1(3-2)+2(4-2)=1+4=5

therefore Volume of parallelopiped with AB,AC and AD as concurrent edges is

V=[bar(AB).(bar(AC)xxbar(AD))]=5 "cubic unit"

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#### APPEARS IN

2013-2014 (March) (with solutions)
Question 3.1.3 | 3.00 marks

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Solution if A, B, C, D are (1, i, I), (2, l ,3), (3; 2, 2) and (3, 3, 4) respetivly., then find the volume of the parallepiped with AB, AC and AD as concurrent edges Concept: Scalar Triple Product of Vectors.
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