If three vectors a, b, c satisfy \[\mathbf{a}+\mathbf{b}+\mathbf{c}=\mathbf{0}\] and \[|\mathbf{a}|\,\,=\,\,3,\,\] \[|\mathbf{b}|\,=5,\] \[|\mathbf{c}|\,\,=7,\] then the angle between a and b is [Kurukshetra CEE 1998; UPSEAT 2001; AIEEE 2002; MP PET 2002]

If three vectors a, b, c satisfy \[\mathbf{a}+\mathbf{b}+\mathbf{c}=\m

1.	If three vectors a, b, c satisfy \[\mathbf{a}+\mathbf{b}+\mathbf{c}=\mathbf{0}\] and \[\|\mathbf{a}\|\,\,=\,\,3,\,\] \[\|\mathbf{b}\|\,=5,\] \[\|\mathbf{c}\|\,\,=7,\] then the angle between a and b is [Kurukshetra CEE 1998; UPSEAT 2001; AIEEE 2002; MP PET 2002]
A.	\[{{30}^{o}}\]
B.	\[{{45}^{o}}\]
C.	\[{{60}^{o}}\]
D.	\[{{90}^{\text{o}}}\]
Answer» D. \[{{90}^{\text{o}}}\]

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If three vectors a, b, c satisfy \[\mathbf{a}+\mathbf{b}+\mathbf{c}=\mathbf{0}\] and \[|\mathbf{a}|\,\,=\,\,3,\,\] \[|\mathbf{b}|\,=5,\] \[|\mathbf{c}|\,\,=7,\] then the angle between a and b is [Kurukshetra CEE 1998; UPSEAT 2001; AIEEE 2002; MP PET 2002]

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