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What is the equation of a circle whose center is at the origin and whose radius is 9? x^2 + y^2 = 3 x^2 + y^2 = 9 x^2 + y^2 = 81
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Feb 11, 2019
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What is the equation of a circle whose center is at the origin and whose radius is 9?
x^2 + y^2 = 3
x^2 + y^2 = 9
x^2 + y^2 = 81
Mathematics
high-school
Skkakkar
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Answer:
3, i hope this is helpful!
Yura Rodchyn
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Feb 11, 2019
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Yura Rodchyn
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Hi there!
Points on circle are equidistant from its center.
This is th' distance called the radius of the circle.
• Cartesian form:-
r : √x² + y² = 9
r : x² + y² = 9²
r : x² + y² = 81
Hence,
Option 3ʳᵈ : x² + y² = 81 is Correct.
~ Hope it helps!
Arseniew
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Feb 16, 2019
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Arseniew
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