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In isosceles triangles A B C ,| vec A B|...

In isosceles triangles `A B C ,| vec A B|=| vec B C|=8,` a point `E` divides `A B` internally in the ratio 1:3, then find the angle between ` vec C Ea n d vec C A(w h e r e| vec C A|=12)dot`

A

`(-3sqrt(7))/(8)`

B

`(3sqrt(8))/(17)`

C

`(3sqrt(7))/(8)`

D

`(-3sqrt(8))/(17)`

Text Solution

Verified by Experts

The correct Answer is:
C
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ARIHANT MATHS-PRODUCT OF VECTORS-Exercise (Single Option Correct Type Questions)
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  13. Given unit vectors m, n and p such that angle between m and n. Angle b...

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  14. If veca and vecb are two unit vectors, then the vector (veca+vecb)xx(v...

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  15. If veca and vecb are othogonal unit vectors, then for a vector vecr no...

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  16. If vector vec i+ 2vec j + 2vec k is rotated through an angle of 90^@...

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  17. 10 different vectors are lying on a plane out of which four are parall...

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  18. If hat(a) is a unit vector and projection of x along hat(a) is 2 units...

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  19. If veca, vecb and vecc are any three non-zero vectors, then the compon...

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  20. The position vector of a point P is r=xhat(i)+yhat(j)+hat(k)z, where x...

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