1.

If a + b + c = 2s, then [(s – a)2 + (s – b)2 + (s – c)2 + s2] = ?

A. (s2 – a2 – b2 – c2)
B. (s2 + a2 + b2 + c2)
C. (a2 + b2 + c2)
D. (4s2 – a2 – b2 – c2)
Answer» D. (4s2 – a2 – b2 – c2)


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