Question

the tsa of a cone whose radius is 2r and slant height 3l is ​

Answer 1

Step-by-step explanation:

TSA of cone=1/3 ×pi×r^2×h at r=r and h =h,but at r=2r and h=3l ; TSA of cone=1/3 × pi ×4r2 ×3l=4×pi×r^2×l