Q.

Two medians drawn from acute angles of a right angled triangle intersect at an angleπ/6 . If the length of the hypotenuse of the triangle is 3 units, then area of the triangle (in sq. units) is

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a

3

b

3

c

2

d

9

answer is A.

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Detailed Solution

Let A(a,0) and B(0,b) then G=a3,b3

Slope of is AN = -b2a  and slope of BM = -2ba 

Now if θ is the angle between the medians then tanθ=m1-m21+m1m2

tan300= -b2a--2ba1+-b2a-2ba =3b2a1+b2a2 

   13=3ba2(a2+b2)                                                                                   

12ab=(a2+b233)      taking a2+b2=9

Two medians drawn from acute angles of a right angled triangle intersect at  an angle pi6 . If the length of the hypotenuse of the triangle is 3 units,  then area of

ab=23

Area of the triangle = 12ab=12×23

=3

 

 

 

 

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