A right circular cone of height h and radius R is cut by a plane parallel to the base at a distance h/4 from the base. The ratio
of the curved surface areas of the resulting cone to the frustum is:
A7 : 16
B16 : 9
C16 : 7
D9 : 7
A7 : 16
B16 : 9
C16 : 7
D9 : 7
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The diameter of circle is times the base of triangle, and the height of triangle is 14cm.If the area of the triangle is 56cm2, then what is the circumference of the circle?(use