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CBSE Class 12-science Answered

 
Asked by kusma1974 | 27 Jan, 2017, 02:25: AM
answered-by-expert Expert Answer
 
begin mathsize 16px style S i n c e space F space i s space t h e space m i d minus p o i n t space o f space B D comma space i n space t r i a n g l e space A B D comma 1 space. space stack A B with rightwards arrow on top space plus space 1 space. space stack A D with rightwards arrow on top space equals space left parenthesis 1 space plus space 1 right parenthesis space stack A F with rightwards arrow on top rightwards double arrow stack A B with rightwards arrow on top space plus space stack A D with rightwards arrow on top space equals space 2 space stack A F with rightwards arrow on top space space space space space space space.... left parenthesis i right parenthesis S i m i l a r l y comma space i n space t r i a n g l e space B C D comma 1 space. space stack C B with rightwards arrow on top space plus space 1 space. space stack C D with rightwards arrow on top space equals space left parenthesis 1 space plus space 1 right parenthesis space stack C F with rightwards arrow on top rightwards double arrow stack C B with rightwards arrow on top space plus space stack C D with rightwards arrow on top space equals space 2 space stack C F with rightwards arrow on top space space space space space space space.... left parenthesis i i right parenthesis A d d i n g space left parenthesis i right parenthesis space a n d space left parenthesis i i right parenthesis comma space w e space g e t stack A B with rightwards arrow on top space plus space stack A D with rightwards arrow on top space plus space stack C B with rightwards arrow on top space plus space stack C D with rightwards arrow on top space equals space space 2 space stack A F with rightwards arrow on top space plus space space 2 space stack C F with rightwards arrow on top rightwards double arrow stack A B with rightwards arrow on top space plus space stack A D with rightwards arrow on top space plus space stack C B with rightwards arrow on top space plus space stack C D with rightwards arrow on top space equals negative 2 space stack F A with rightwards arrow on top space minus space space 2 space stack F C with rightwards arrow on top rightwards double arrow stack A B with rightwards arrow on top space plus space stack A D with rightwards arrow on top space plus space stack C B with rightwards arrow on top space plus space stack C D with rightwards arrow on top space equals negative 2 space left parenthesis stack F A with rightwards arrow on top space plus space space space stack F C with rightwards arrow on top right parenthesis rightwards double arrow stack A B with rightwards arrow on top space plus space stack A D with rightwards arrow on top space plus space stack C B with rightwards arrow on top space plus space stack C D with rightwards arrow on top space equals negative 2 space left parenthesis 2 space stack F E with rightwards arrow on top right parenthesis rightwards double arrow stack A B with rightwards arrow on top space plus space stack A D with rightwards arrow on top space plus space stack C B with rightwards arrow on top space plus space stack C D with rightwards arrow on top space equals 4 space stack E F with rightwards arrow on top end style
Answered by Rashmi Khot | 27 Jan, 2017, 10:54: AM

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CBSE 12-science - Maths
pls solve
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Asked by sdmbotch1123 | 18 Jan, 2023, 11:01: PM
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CBSE 12-science - Maths
If |𝑎⃗| = 3 and −1 ≤ 𝑘 ≤ 2, then |𝑘𝑎⃗| lies in the interval (a) [0,6] (b) [−3,6] (c) [3,6] (d) [1,2]
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Asked by mohdtayyab682 | 18 Jan, 2023, 10:34: PM
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CBSE 12-science - Maths
maths
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Asked by durgaprasaddurgaprasad174 | 01 Jul, 2022, 05:05: PM
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CBSE 12-science - Maths
Find the area of a triangle joining the points A(1,1,1), B(1,2,3), and C(2,3,1) as its vertices. The above question is from the vectors chapter. 
Asked by sujaychandramouli | 24 May, 2022, 10:46: AM
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CBSE 12-science - Maths
v=e^xyz(i+j+k) find curl v
Asked by abhimeena1011 | 18 Jan, 2022, 10:43: AM
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CBSE 12-science - Maths
a=-2i+j-3k,b=5i+3j-2k if 3a+2b-c then third vector is
Asked by gurupadam3101985 | 11 Apr, 2020, 10:06: AM
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CBSE 12-science - Maths
17th sum plz
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Asked by lovemaan5500 | 07 Feb, 2020, 09:49: AM
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CBSE 12-science - Maths
Plz asnwer 15 (ii)part
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Asked by lovemaan5500 | 07 Feb, 2020, 09:49: AM
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CBSE 12-science - Maths
18th sum plz
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Asked by lovemaan5500 | 16 Dec, 2019, 09:34: PM
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CBSE 12-science - Maths
Write the position vector of point which divides the join of points with position vectors 3a-2b and 2a+3b in ratio 2:1. (a and b are vectors)
Asked by Vivek.d8765 | 29 Oct, 2019, 10:14: PM
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