It is known that the lateral expansion of a cone is a fan with a central angle of 36°, and the area of the fan is 10πcm**2. Find the surface area of this cone.
已知：一个圆锥的侧面展开图是圆心角为36°的扇形，扇形面积为10πcm**2．求这圆锥的表面积．
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