Question

What is the surface area of the cone?

image below!

Answer 1

use the formula

SA = pi*r^2 + pi*r*s

where

r = radius
s = slant height

Answer 2

okay can you check my answer please

Answer 3

sure

Answer 4

im not done yet though

Answer 5

ok

Answer 6

SA= pi*8^2+pi*8^2*10^2

Answer 7

and i dont know what to do from then

Answer 8

what is 8^2

Answer 9

there*

Answer 10

and the pi*8^2*10^2 should be pi*8*10

Answer 11

64

Answer 12

so i dont square anything?

Answer 13

SA = pi*r^2 + pi*r*s

SA = pi*8^2 + pi*8*10

SA = pi*64 + pi*8*10

SA = pi*64 + pi*80

SA = 64pi + 80pi

what's next?

Answer 14

multiply?

Answer 15

think of it like 64x + 80x

Answer 16

what do you do to simplify that

Answer 17

sqrt?

Answer 18

64x + 80x = ???

Answer 19

combine ?

Answer 20

yep, to get what?

Answer 21

144

Answer 22

wait thats the answer huh?

Answer 23

so

SA = pi*r^2 + pi*r*s

SA = pi*8^2 + pi*8*10

SA = pi*64 + pi*8*10

SA = pi*64 + pi*80

SA = 64pi + 80pi

SA = 144pi

Answer 24

final answer: 144π in^2

Answer 25

right? or wrong

Answer 26

yep correct

Answer 27

thanks mister :)

Answer 28

you're welcome