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In a DeltaABC, if a=13, b=14and c=15, t...

In a `DeltaABC,` if `a=13, b=14and c=15, ` then `angle A` is equal to (All symbols used have their usual meaning in a triangle.)

A

`sin ^(-1)""4/5`

B

`sin ^(-1)""3/5`

C

`sin ^(-1)""3/4`

D

`sin ^(-1)""2/3`

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The correct Answer is:
A
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ARIHANT MATHS-PROPERTIES AND SOLUTION OF TRIANGLES -Exercise (Single Option Correct Type Questions)
  1. In a DeltaABC, if a=13, b=14and c=15, then angle A is equal to (All s...

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  2. In a DeltaABC, if b =(sqrt3-1) a and angle C=30^(@), then the value of...

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  3. In a Delta ABC, if angle C =105^(@), angleB=45^(@) and length of side ...

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  4. If P is a point on the altitude AD of the Delta ABC such that angle CB...

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  5. In DeltaABC, if 2b =a+ c and A-C=90^(@), then sin B equal All symbol...

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  6. Let ABC be a right triangle with length of side AB=3 and hyotenus AC=5...

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  7. Two medians draen form the acute angles of a right angled triangle int...

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  8. If in a right angle DeltaABC,4 sin A cos B-1 =0 and tan A is finite, t...

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  9. Let A=[{:(a,b,c),(p,q,r),(1,1,1):}]and B=A^(2) If (a-b)^(2) +(p-q)^(...

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  10. If in a DeltaABC, the incricle passing through the point of intersecti...

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  11. If two sides of a triangle are roots of the equation x^2-7x+8=0 and th...

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  12. If median AD of a triangle ABC makes angle (pi)/(6) with side BC, then...

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  13. If the perimeter of the triangle formed by feet of altitudes of the t...

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  14. In a triangle with one angle (2pi)/(3), the lengths of the sides form ...

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  15. Sides of triangle ABC are in A.P. if a < min {b, c} then cos A is equ...

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  16. The product of the sines of the angles of a triangle is p and the prod...

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  17. Let C be incircle of DeltaABC. If the tangenst of lengths t(1), t(2) a...

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  18. If the sine of the angles of DeltaABC satisfy the equation c^(3)x^(3)-...

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  19. The rational number which equals the number 2. 357 with recurring de...

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  20. In a triangle ABC, a ge b ge c. If (a^(3)+b^(3)+c^(3))/(sin ^(3)A +s...

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