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In Delta ABC, if a=4 cm,b=5 cm,c=7 cm, t...

In `Delta ABC`, if a=4 cm,b=5 cm,c=7 cm, then `cos ""A/2`=

A

`1//sqrt5`

B

`1//sqrt2`

C

`sqrt(32//35)`

D

`2//3`

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The correct Answer is:
C
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DIPTI PUBLICATION ( AP EAMET)-PROPERTIES OF TRIANGLES -EXERCISE 1A
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  3. In Delta ABC, if a=4 cm,b=5 cm,c=7 cm, then cos ""A/2=

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  4. In Delta ABC, if a=4 cm,b=7 cm,c=9 cm, then tan ""A/2=

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  5. In Delta ABC, if a=13 cm, b=12 cm,c=5 cm, then sin ""A/2=

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  6. In Delta ABC, if a=3 cm, b=4 cm, c=5 cm, then cos ""C/2=

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  7. In Delta ABC, if a=13 cm, b=14 cm, c=15 cm, then tan ""C/2=

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  8. In Delta ABC, if a=7,b=7sqrt3 and right angled at C, then c=

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  9. If the angles of a triangle are in A.P,a=2, c=4 then b=

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  11. If the angles of a triangle are 30^@,45^@ and the included side is sqr...

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  12. If two angles of a Delta ABC are 45^@ and 60^@, then the ratio of the ...

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  13. In a triangle if the sum of two sides is x and their product is y such...

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  14. IF 4,5 are two sides of a triangle and the included angle is 60^@, the...

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  15. IF 13,14,15 are the sides of the triangle , then the area of the trian...

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  16. In Delta ABC, if a= 2, B=120^@, C=30^@, then the area of the triangle ...

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  17. In Delta ABC, if c^2=a^2+b^2,2s=a+b+c, then 4s(s-a)(s-b)(s-c)=

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  19. In a triangle ABC, medians AD and BE are drawn.IF angle D=4, angle DAB...

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