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The perimeter DeltaABC is 3 times the a...

The perimeter `Delta`ABC is 3 times the arithmetic mean of the sine of its of its angles . If the side 'b'=1, then the angle B equal to :

A

`pi/6`

B

`pi/3`

C

`pi/2`

D

none of these

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The correct Answer is:
C
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PATHFINDER-SOLUTION OF TRIANGLE AND HEIGHT AND DISTANCE-QUESTION BANK
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  2. ABC is a right angled Delta in which angleB=90^@ and BC =a. If n point...

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  3. The perimeter DeltaABC is 3 times the arithmetic mean of the sine of ...

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  4. Let A0A1A2A3A4A5 be a regular hexagon inscribed in a circle of unit ra...

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  5. If twice the square of the diameter of a circle is equal to half the s...

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  6. If in DeltaABC,1/(a+c)+1/(b+c)=3/(a+b+c), then angleC is equal to

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  7. In a DeltaABC, the point D divides BC in the ratio 1:2 Also AD is perp...

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  8. In a triangle with sides a, b and c a semicircle touching the sides A...

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  9. From the top of a tower , which is 240m high , if the angle of depres...

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  10. If the length of the shadow of a vertical pole on the horizontal groun...

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  11. The ratio of the length of a rod and its shadow is sqrt3:1:. The angle...

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  12. If the angles of elevation of a tower from two points distance a and b...

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  13. The angle of depression of two boatsm as observes from the masthead o...

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  14. A tower subtends an angle of 30^@ at a point on the same level as its ...

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  15. The shadow of a tower , when the angle of elevation of the sun is 45^@...

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  16. The angles of depression of the top and bottom of 8 m tall tower from ...

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  17. The angles of elevation of the bottom and the top of the tower fixed ...

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  18. A tower is 10sqrt3 metres high. If a point on the ground is 30m away ...

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  19. The shadow of a vertical tower on level of ground increased by 10m wh...

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  20. Two posts are just on the opposite side of a road. The heights of the ...

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