If the circumference of the bottom circle of the cone is 4 π cm and the generatrix length is 6cm, then the degree of the center angle of the expanded side area of the cone is 4 π cm_______

Radius of bottom surface = 4 π / 2 π = 2 cm
Degree of center angle = 360 °× (2 △ 6) = 360 °× 1 / 3 = 120 °

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