Q.

The area of an equilateral triangle inscribed in the circle x2+y2+4x−10y−7=0  is

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a

93

b

193

c

273

d

27

answer is C.

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Detailed Solution

In an equilateral triangle altitude is p=r+r2 C=(−2,5)r=4+25+7=6p=r+r2=3r2Δ=p23=9r243=273
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