waheguru
need some help im getting 311



This Question is Closed

GT
Best Response
You've already chosen the best response.
3
ok

jhonyy9
Best Response
You've already chosen the best response.
0
???

karatechopper
Best Response
You've already chosen the best response.
0
311?

waheguru
Best Response
You've already chosen the best response.
0
im posting the question sorry

waheguru
Best Response
You've already chosen the best response.
0

waheguru
Best Response
You've already chosen the best response.
0
here we are

meverett04
Best Response
You've already chosen the best response.
2
Do you have the formula for the surface area of a cylinder?

waheguru
Best Response
You've already chosen the best response.
0
2pirsq plus 2pirh

GT
Best Response
You've already chosen the best response.
3
Surface area of fully cylinder = circumference * length. Here, you have half of it. So, 1/2*circumference*length = 1/2 * pi * 6 * 30 = 90 * pi

jhonyy9
Best Response
You've already chosen the best response.
0
a.

GT
Best Response
You've already chosen the best response.
3
waheguru  that is when including bottom and top circles. In this case, the roof has no such thing. So, you just need 1/2 circumference * length.

asnaseer
Best Response
You've already chosen the best response.
0
@GT is right

waheguru
Best Response
You've already chosen the best response.
0
oh so i included the bottom???

GT
Best Response
You've already chosen the best response.
3
Yeah. Don't.

waheguru
Best Response
You've already chosen the best response.
0
k so this is what i did
2 x pi x 3^2 + 2 x pi x 3 x 30 and divide by 2

duha2011
Best Response
You've already chosen the best response.
0
hi

GT
Best Response
You've already chosen the best response.
3
Remove 3*pi*r^2 and the rest is good.

waheguru
Best Response
You've already chosen the best response.
0
y

jhonyy9
Best Response
You've already chosen the best response.
0
a. is right sure

GT
Best Response
You've already chosen the best response.
3
Because the roof does not have a base and top (according to the problem description).

asnaseer
Best Response
You've already chosen the best response.
0
the question is asking for the area of the roofs curved surface  that does not include the two ends of the greenhouse

waheguru
Best Response
You've already chosen the best response.
0
so just the lateral

GT
Best Response
You've already chosen the best response.
3
yes.

waheguru
Best Response
You've already chosen the best response.
0
thx brozz

asnaseer
Best Response
You've already chosen the best response.
0
the curved surface of a cylinder has a surface area of \(2\pi rh\). in this case you have half a cylinder, so the surface area becomes \(\pi rh\)

duha2011
Best Response
You've already chosen the best response.
0
HI GUYS

waheguru
Best Response
You've already chosen the best response.
0
just practising for grade 9 EQAO

asnaseer
Best Response
You've already chosen the best response.
0
what is EQAO?

waheguru
Best Response
You've already chosen the best response.
0
evil questions attacking ontario lol im kidding its like an exam for grade 9 students

asnaseer
Best Response
You've already chosen the best response.
0
lol! :D  good luck with them...

waheguru
Best Response
You've already chosen the best response.
0
thx

jhonyy9
Best Response
You've already chosen the best response.
0
is half perimeter of base multiply lenght=surface area

jhonyy9
Best Response
You've already chosen the best response.
0
this very easy

asnaseer
Best Response
You've already chosen the best response.
0
@jhonyy9  things are always easy when you know how to do them  try and recall the days when you were also at the lower end of the learning curve :)

asnaseer
Best Response
You've already chosen the best response.
0
like we ALL were

jhonyy9
Best Response
You've already chosen the best response.
0
yes right but this is the same like a rectangle curved on the base