Question

find the surface are of the cylinders

Answer 1

\[SA=2\pi rh+2\pi r^2\]
or

Answer 2

\[SA=LA+2B\]

Answer 3

formula is correct

Answer 4

problem is im not sure how to do it

Answer 5

you have formula, you have values
17. r=2, h=8

Answer 6

in 19th, i think that 7in is the diameter given, you need to find the radius from it

Answer 7

\[LA=2 \pi (2*8)\]\[LA=2 \pi (16)\]

Answer 8

yes

Answer 9

ok so what do i do now that i have that part

Answer 10

SA=2πrh+2πr^2
you got 2πrh = 32pi
find 2πr^2

Answer 11

\[2\pi 9\]
\[18\pi\]

Answer 12

why did u take r=3 ? :O

Answer 13

lol i meant t ill fix it

Answer 14

\[2 \pi 4\]
\[8\pi\]

Answer 15

yesss

Answer 16

so now \[32\pi+8\pi=40\pi\]

Answer 17

thats absolutely correct for 17th

Answer 18

125.663706144
SA=125.7

Answer 19

wait i didnt have to do the last part

Answer 20

125.7 is approximate answer, only if the answer is not acceptable in terms of pi

Answer 21

\[[SA=2\pi (3.5*11)+2(3.5^2)\]

Answer 22

it said keep in terms of pi

Answer 23

then 40pi is correct
and yes, for 19th thats correct too, just simplify

Answer 24

\[SA=2\pi (38.5)+2\pi (12.25)\]

Answer 25

this is where im confused what to do

Answer 26

2(38.5+12.25) = 101.5

Answer 27

so \[SA=101.5\pi\]

Answer 28

yesss

Answer 29

ah thanks again @hartnn for helping :D

Answer 30

welcome ^_^