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,b3Slope of is AN = -b2a and slope of BM = -2ba Now if θ is the angle between the medians then tanθ=m1-m21+m1m2tan300= -b2a--2ba1+-b2a-2ba =3b2a1+b2a2 ⇒13=3ba2(a2+b2) ⇒12ab=(a2+b233) taking a2+b2=9ab=23Area of the triangle = 12ab=12×23=3
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