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If 4,5 are two sides of a triangle and...

If 4,5 are two sides of a triangle and included angle ` 60 ^(@) , ` then its area is

A

` 3sqrt3`

B

` 2sqrt3`

C

` 4 sqrt3 `

D

` 5 sqrt3`

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The correct Answer is:
D
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AAKASH SERIES-PROPERTIES OF TRIANGLES-PRACTICE EXERCISE
  1. In Delta ABC , if a: b: c = 3: 4:5 then sin A : sin B : sin C =

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  2. Cot A +Cot B +cot C =

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  3. If 4,5 are two sides of a triangle and included angle 60 ^(@) , ...

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  4. Area of triangle is 75 cm^(2) and two of its sides 20 cm, 15cm ,t...

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

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  6. If the sides of a triangle are 5, 7, 8 then its area is

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  7. If the area of Delta ABC with sides a,b,c is Delta, then the are...

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  8. Two angles of a triangles are (pi)/(6) and (pi)/(4) included si...

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  9. If in Delta ABC, b-c = 3sqrt3 , A= 120 ^(@) and the area of Delt...

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  10. In Delta ABC , ( bc cos A + c a cos B + ab cos C) /( cot A + cot B ...

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  11. If a = 5, b= 12 ,c = 13 then R =

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  12. If a cos A = b cos B then triangle ABC is

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  13. In Delta ABC , sum a (sin B - sin C)

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  14. In Delta ABC, sum a .sin (B-C)=

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  15. In Delta , sum a^(3) sin (B-C) =

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  16. In Delta ABC , R^(2) ( sin 2A +sin 2B+ sin 2C) =

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  17. If alpha, beta , gamma are the lengths of the altitudes of Delta A...

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  18. If p1,p2,P3 are the lengths of the altitudes from the vertices of...

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  19. If p1, p2, p3 are the lengths of the altitudes from the vertices...

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  20. If cos ^(2) A + cos ^(2) B = cos ^(2) C = 1 then show that Delta A...

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