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In the adjoining figure angleBAC=60^(@) ...

In the adjoining figure `angleBAC=60^(@) and BC = a, AC = b and AB = c`, then :

A

`a^(2)=b^(2)+c^(2)`

B

`a^(2)=b^(2)+c^(2)-bc`

C

`a^(2)=b^(2)+c^(2)`

D

`a^(2)=b^(2)+2bc`

Text Solution

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The correct Answer is:
B
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ARIHANT SSC-GEOMETRY-INTRODUCTORY EXERCISE - 12.2
  1. In the triangle ABC, side BC is produced to D. angleACD=100^(@) if BC ...

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  2. In the adjoining figure D, E and F are the mid - points of the sides B...

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  3. In the adjoining figure angleBAC=60^(@) and BC = a, AC = b and AB = c,...

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  4. In the adjoining figure of DeltaABC, angleBCA=120^(@) and AB = c, BC =...

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  5. In a right angled DeltaABC, angleC=90^(@) and CD is the perpendicular ...

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  6. If the medians of a triangle are equal, then the triangle is

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  7. The incentre of a triangle is determined by the :

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  8. The circumcentre of a triangle is determined by the :

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  9. The point of intersection of the angle bisectors of a triangle is :

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  10. The diagonal of the square field measures 50m. The area of square fiel...

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  11. If in a DeltaABC,'S' is the circumcentre then :

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  12. If AD, BE, CF are the altitudes of DeltaABC whose orthocentre is H, th...

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  13. In a right angled DeltaABC, angleC=90^(@) and CD is the perpendicular ...

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  14. In an equilateral triangle ABC, if a, b and c denote the lengths of pe...

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  15. What is the ratio of side to the height of an equilateral triangle?

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  16. The triangle is formed by joining the mid point of the sides AB, BC an...

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  17. One side other than the hypotenuse of right angle isosceles triangle i...

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  18. Any two of the four triangles formed by joining the mid - points of th...

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  19. The internal bisectors of angleB and angleC of DeltaABC meet at O. If ...

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  20. The point in the plane of a triangle which is at equal perpendicular d...

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