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If (cos A )/( a ) =(cos B)/(b)=(cos C)/...

If ` (cos A )/( a ) =(cos B)/(b)=(cos C)/(c)` then the ` DeltaABC` is

A

isosceles

B

right angled

C

equilateral

D

no conclusion

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HIMALAYA PUBLICATION-MEASUREMENT OF ANGLES, TRIGONOMETRIC RATIOS AND RELATION BETWEEN SIDES AND ANGLES OF A TRIANGLE-QUESTION BANK
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  2. If tan A=(1)/(3), tan B=(2)/(7) then cot (A+B)=

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  3. If (cos A )/( a ) =(cos B)/(b)=(cos C)/(c) then the DeltaABC is

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  4. In a triangle A B C, if a, b, c are in A.P then tan (A)/(2), tan (B)/(...

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  5. 4 cos 36^(circ)+cot (7 (1)/(2))^(circ)=

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  6. If a=5, b=13, c=12 in a triangle A B C, then tan ((B)/(4))=

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  7. The value of sin^(2)5^(@)+sin^(2)10^(@)+sin^(2)15^(@)+ . . . .+sin^(2)...

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  8. The triangle A B C is right angled at C, then tan A+tan B=

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  9. The value of (cot 54^(circ))/(tan 36^(circ))+(tan 20^(circ))/(cot 70^(...

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  10. If A and B are two points of a circle of radius r with centre at the p...

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  11. The value of "cos"^(2)(pi)/(12)+"cos"^(2)(pi)/(4)+"cos"^(2)(5pi)/(12) ...

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  12. Radii of two circles are 5 cm and 3 cm respectively and the distance b...

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  13. In a DeltaABC if |(1,a,b),(1,c,a),(1,b,c)|=0 then Sin^(2)A+Sin^(2)B+...

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  14. The acute angle in radians between the minute and the hour hands of a ...

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  15. If 0ltxlt(pi)/(2), then the largest angle of a triangle whose sides ar...

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  16. cos 1^(circ)+cos 2^(circ)+cos 3^(circ)+...+cos 180^(circ)=

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  17. The value of (tan 70^(circ)-tan 20^(circ))/(tan 50^(circ))=

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  18. The circum-radius of the triangle whose sides are 13, 12 and 5 is...

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  19. IfA+B+C = 180^(@) then sumtan(A)/(2)tan(B)/(2)=

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  20. If 0lexlepi and 81^(sin^(2x))+81^(cos^(2x))=30 then x=

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