[填空题]
A solid right circular cone has a base radius ofup5s .fnq4j,b 1818 cm andzp5 *d 24r vbnkre7h*v a slant height of 3030 cm. A smaller right circular cone, with a *hbrr2kdvpv*n5 7 ez 4vertical height of 88 cm and a slant height of 1010 cm, is removed from the top of the larger cone, as shown in the diagram.
1.Calculate the radius of the base of the cone which has been removed. cm
2.Calculate the curved surface area of the cone which has been removed. $cm^2$
3.Calculate the curved surface area of the remaining solid. $cm^2$
