True: The equation of a circle whose center is at the origin is x2 + y2 = r2., In the equation 𝑥2 + 𝑦2 = 16,  the center of the circle is at (0, 0) and the radius is 4., The center of a circle given the equation (𝑥 + 2)2 + (𝑦 + 2)2 = 36 is at (-2, -2)., False: (𝑥 − ℎ)2 − (𝑦 − 𝑘)2 = 𝑟2 is the equation of a circle whose center is at (h, k), The radius of a circle given the equation (𝑥 + 2)2 + (𝑦 + 2)2 = 36 is 18.,

Equation of a Circle (Center-Radius Form)

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