If a → , b → , c → are vectors such that a → + b → + c → = 0 and   a → = 7 ,   b → = 5 ,   c → = 3 then angle between vector b → and   c → is

Question

If a &#8594; , b &#8594; , c &#8594; are vectors such that a &#8594; + b &#8594; + c &#8594; = 0 and &#160; a &#8594; = 7 , &#160; b &#8594; = 5 , &#160; c &#8594; = 3 then angle between vector b &#8594; and &#160; c &#8594; is

Aicharya · Accepted Answer

Given a &#8594; + b &#8594; + c &#8594; = 0 &#8658; b &#8594; + c &#8594; = - a &#8594; &#8658; b &#8594; + c &#8594; 2 = - a &#8594; 2 &#8658; b &#8594; 2 + c &#8594; 2 + 2 b &#8594; &#183; c &#8594; = a &#8594; 2 Let M be the angle between b &#8594; and c &#8594; &#8658; 25 + 9 + 2 * 5 * 3 &#160; cos M &#160; = &#160; 49 &#8658;&#160;&#160; cos M = 1 2 &#8658; M = 60 &#176;

If a → , b → , c → are vectors such that a → + b → + c → = 0 and  …

Solution

If a &#8594; , b &#8594; , c &#8594; are vectors such that a &#8594; + b &#8594; + c &#8594; = 0 and &#160;…

Solution

If a → , b → , c → are vectors such that a → + b → + c → = 0 and …