एक वृत्त का क्षेत्रफल (π 4x²+ π 12xy + π 9y²) है। इस वृत्त की त्रिज्या ज्ञात कीजिए-
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1)Take π common
now;eq= π(4x²+12xy+9y²)
2)π[(2x)²+2(2x)(3y)+(3y)²]
3)π(2x+3y)²
4)π(2x+3y)(2x+3y)
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