What is the standard equation of a circle?

Related questions

• How do you identify conic sections?
• What is the meaning of conic section?
• What is the standard equation of a parabola?
• What is the standard equation of a hyperbola?
• Which conic section has the polar equation #r=1/(1-cosq)#?
• Which conic section has the polar equation #r=2/(3-cosq)#?
• Which conic section has the polar equation #r=a sintheta#?
• How do you find a polar equation for the circle with rectangular equation #x^2+y^2=25#?
• What are the polar coordinates of #(x-1)^2-(y+5)^2=-24#?
• How do you write the polar equations for # x = -3#?