Question

could use some help to figure out the answer.it says use the net to find the surface area of the cylinder,give your answer in terms of pi. it has a square with 2 circles one on to and one on the bottom,the bottom circle has 4yd on the side of the square it has 14yd.

Answer 1

surface area of a circle = pi*r^2
if you take the top and bottom off of a cylinder and cut it then it will form a rectangle, the length of the rectangle is given, the width is the circumference of the circle which is:
2piR or dR
add the area of the unrolled cylinder (aka rectangle) and the 2 circles to get total area.

Answer 2

still some what confused not a big fan of Geometry.. could you show me how to break it down with the circle 4yd and the side cylinder 12yd..just so i have a better understanding..thank you

Answer 3

yes

Answer 4

the second picture?

Answer 5

yes 4yd and the first on 12yd how do i solve it in terms of pi..sorry i am not very good at this

Answer 6

ok so 4 yds from the middle to the edge?

and 12 yards tall?

Answer 7

yes

Answer 8

(your original instruction said 14 yards, I will use 12

Answer 9

ok

Answer 10

ok for the area of a circle we use pi * r^2
pi = 3.14, 4yds squared is 16 yards,
=16pi squared or 50.24yds squared.
you have two of those circles

for the cylinder that is now a rectangle:
the height is 12yds, the width is equal to the circumference of the circle.
circumference is diameter * pi
8*pi (times the height of 12yd) = an area of 96pi

so total surface area:
96pi+16pi+16pi = 128pi squared
or 402.1238597 yds squared

Answer 11

wow that is amazing..sorry i have never did Geometry before..thank you so much for helping me figure this out..when they pi the only pi i know is the one you eat =) if i can get past these last 2 post i will be done with school October 31st..thank you so much.

Answer 12

you bet, good luck.