Question

What is the equation of the circle with center at the origin and radius 7? *

x² + y² = 49
x² + y² = 36
x² + y² = 7
x² + y² = 64

Answer 1

Answer:

$x^{2} + y^{2} = 49$

Step-by-step explanation:

Equation of a circle with the origin as the center is $x^{2} + y^{2} = r^{2}$

Hence the equation of the circle with origin as center with radius 7 is $x^{2} + y^{2} = 7^{2}$

⇒ $x^{2} + y^{2} = 49$

Hence the answer is option (a).

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GeniusH