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In a triangle ABC, let 2a^2+4b^2+ c^2= 2...

In a triangle ABC, let `2a^2+4b^2+ c^2= 2a(2b + c)` , then which of the following holds good?

A

` cos B =(-7)/(8)`

B

`sin (A-C)=0`

C

`(r )/(r_(1)=1/5`

D

`sin A : sin B :si C=1:2:1`

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The correct Answer is:
A, B, C
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ARIHANT MATHS-PROPERTIES AND SOLUTION OF TRIANGLES -Exercise (Questions Asked In Previous 13 Years Exam)
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  13. Consider the circle x^2 + y^2 = 9 and the parabola y^2 = 8x. They inte...

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  14. Consider the circle x^2 + y^2 = 9 and the parabola y^2 = 8x. They inte...

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  15. Internal bisector of /A of triangle ABC meets side BC at D. A line dra...

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  16. Given an isosceles triangle, whose one angle is-2pi/3 and the radius o...

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  17. In Delta ABC, which one is true among the following ?

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