A cardboard sheet in the form of a circular sector of radius 20 cm and central angle\[\mathbf{10}{{\mathbf{8}}^{{}^\circ }}\] is folded to make a cone. What is the radius of the cone?

A cardboard sheet in the form of a circular sector of radius 20 cm and

1.	A cardboard sheet in the form of a circular sector of radius 20 cm and central angle\[\mathbf{10}{{\mathbf{8}}^{{}^\circ }}\] is folded to make a cone. What is the radius of the cone?
A.	6 cm
B.	18 cm
C.	21 cm
D.	4 cm
Answer» B. 18 cm

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A cardboard sheet in the form of a circular sector of radius 20 cm and central angle\[\mathbf{10}{{\mathbf{8}}^{{}^\circ }}\] is folded to make a cone. What is the radius of the cone?

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