A rectangular sheet is converted to a cone with base radius is 21 m and height 28 m is made up of clothes. If width of the sheet is 3 m, then what is the length of rectangular sheet ?
1
490 m
2
560 m
3
770 m
4
880 m
A rectangular sheet is converted to a cone with base radius is 21 m and height 28 m is made up of clothes. If width of the sheet is 3 m, then what is the length of rectangular sheet ?