Solution: According to the fact that the edge is a semicircle, the generatrix can be set as X, and the circumference of the cone bottom is π*x (semicircle circumference), then the radius of the bottom circle is x/2 (using the circumference as 2πR), and the radius ratio of the generatrix to the bottom is 2: 1.

(2) The cone angle is 30 (or 60, if you don't know what the cone angle is, calculate it yourself).

(3) Total area = bottom area+lateral area = π * (x/2) 2+π * x 2/2 = 3/4 π x 2 = 27 π (x is 6).

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