Question

find the curved surface area of cone
r=10
h=21
l=?
formula= πrl
I mark branliest to first question​

Answer 1

Answer:

730.73cm²

Step-by-step explanation:

using pythagorean theorem to find the slant height

a²+b²= c²

10²+21²= c²

100+441= c²

541= c²

c=√541

c= 23.26

formula= πrl

π*10*23.26

π*232.6

= 730.73cm²