Is this equation standard form of an ellipse or circle?
-3x^2-3y^2-12x-12y+24=0
what's the center?

ca = ec

cpctc makes it so that corresponding parts of the triangle you proved to be equal are equal, the other options aren't part of the part of the triangles you proved to be equal.

step-by-step explanation:

left be aligning the decimal points is required to not required see the number of digits to the right