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If `vec x` and `vec y` are two non-collinear vectors and ABC is a triangle with side lengths a,b and c satisfying (20a-15b)`vec x` + (15b-12c)`vec y` + (12c-20a)`vec x xx vec y` is:

A

an acute angled triangle

B

an obtuse -angled triangle

C

a right - angled triangle

D

an isosceles triangle

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The correct Answer is:
C
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DISHA PUBLICATION-VECTOR ALGEBRA-EXERCISE -2 : CONCEPT APPLICATOR
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  12. Let vecOB = hati + 2hatj + 2hatk " and" vecOA = 4hati + 2hatj + 2hatk ...

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  13. If a1 , a2 and a3 are three numbers satisfying a1^2 + a2^2 +a3^2 = 1 ,...

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  14. Let veca , vecb and vec c be non coplanar unit vectors equally incl...

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  15. Let veca , vecb, vec c be three non coplanar vectors , and let vecp ,...

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  16. Let veca= 2hati+hatj -2hatk and vecb=hati+hatj. If vec c is a vecto...

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  17. Let vec r , vec a , vec b and vec c be four non zero vectors such tha...

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  18. Let vec r = (veca xx vecb) sin x + (vecb + vec c) cos y + 2 (vec c xx...

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  19. A girl walks 4 km towards west, then she walks 3 km in a direction 30...

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  20. If vec a+vec b+vec c=0, prove that (vec a xx vec b)=(vec b xx vec c)=(...

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