Question

Find the surface area of the cylinder in terms of pi.
A. 504 cm2

B. 333 cm2

C. 382.5 cm2

D. 211.5 cm2

Answer 1

the surface are of cylinder is given by 2pi.r.(r+h)
where r is the radius
h is the height.
does this help?

Answer 2

no

Answer 3

ok,the height h=19 cm
the diameter=9 cm
so can u tell me the radius?

Answer 4

4.5?

Answer 5

right.
so now u have r=4.5,h=19
put this in
2pi r*(r+h)
and tell me what u get?

Answer 6

i got 664.4468

Answer 7

SA=2 pi r2+2pi r h

Answer 8

but u also plugged in pi value,
whats the answer without plugging pi value??

Answer 9

105.75?

Answer 10

u divide 664.44 by pi

Answer 11

211.5

Answer 12

wrong

Answer 13

ugh. i give up

Answer 14

yup ,right :) 211.5 is correct :)

Answer 15

thank you!

Answer 16

@SmileyFace13 ,211.5 is actually the correct answer which u got....

Answer 17

welcome :)

Answer 18

wrong

Answer 19

whats wrong?
2*4.5*(4.5+19)=211.5

Answer 20

oh! in terms of pi
you r correct. sorry

Answer 21

its ok :)