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Find the equation of a circle with origi...

Find the equation of a circle with origin as centre and which circumscribes and equilateral triangle whose median ids of length `3adot`

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Given,length of the median `AD=3a`
Radius of the circle=2/3xxLength of median
=`2/3xx3a=2a`
So, the equation of the circle is `x^2+y^2=4a^2`.
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