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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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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 triangle ABC such the /C B P...

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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 drawn from the acute angles of a right angled triangle ...

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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. Find (d^2y)/dx^2 , if y = cos^(-1)x

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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. If the sides of a Delta ABC are in AP and a is the smallest sie, then ...

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  16. If p is the produce of the since of angles of a triange, and q the pro...

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

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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. In triangle ABC, medians AD and CE are drawn AD = 5, angle DAC = pi//8...

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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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