Question

find the total surface area of cone whose base radius is 8cm and sum of radius and slant height is 21cm ​

Answer 1

Answer:

you can do this

Step-by-step explanation:

and will be 728.85

cm²

Answer 2

Step-by-step explanation:

Gn: r+l=21

TSA of cone=

= \pi \times r(l + r)=π×r(l+r)

= \frac{22}{7} \times 8 \times 21=722×8×21

= 22 \times 8 \times 3=22×8×3

= 528=528