self Maths Puzzle

If a,b,c are real and a^3+b^3+c^3=3abc and a+b+c not equal to zero, then the relation between a,b,c will be

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self Other Question

The radius of the circumcircle of the triangle made by x-axis, y-axis and 4x+3y=12 is If P,R,T are the area of a parallelogram, a rhombus and a triangle standing on the same base and between the same parallels, which of the following is true?
(A)RT
(C)R=P=T
(D)R=P=2T