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Find the answer to the first question in Exercise 4.1(1page 24), which is a compulsory subject in senior high school mathematics.
(x- 1)^2+y^2=(√6)^2？ A circle with (1.0) as the center and √6 as the radius.
(x+ 1)^2+(y-2)^2=3^2？ A circle with (-1.2) as the center and 3 as the radius.
(x+a)^2+y^2=a^2？ A circle with (-a.0) as the center and |a| as the radius.
x^2+(y-b)^2=(√3b)^2？ A circle with (0, b) as the center and √3|b| as the radius.