Question

need some help im getting 311

Answer 1

ok

Answer 2

???

Answer 3

311?

Answer 4

im posting the question sorry

Answer 5

here we are

Answer 6

Do you have the formula for the surface area of a cylinder?

Answer 7

2pirsq plus 2pirh

Answer 8

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

Answer 9

a.

Answer 10

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.

Answer 11

@GT is right

Answer 12

oh so i included the bottom???

Answer 13

Yeah. Don't.

Answer 14

k so this is what i did


2 x pi x 3^2 + 2 x pi x 3 x 30 and divide by 2

Answer 15

hi

Answer 16

Remove 3*pi*r^2 and the rest is good.

Answer 17

y

Answer 18

a. is right sure

Answer 19

Because the roof does not have a base and top (according to the problem description).

Answer 20

the question is asking for the area of the roofs curved surface - that does not include the two ends of the greenhouse

Answer 21

so just the lateral

Answer 22

yes.

Answer 23

thx brozz

Answer 24

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 \(\pi rh\)

Answer 25

HI GUYS

Answer 26

just practising for grade 9 EQAO

Answer 27

what is EQAO?

Answer 28

evil questions attacking ontario lol im kidding its like an exam for grade 9 students

Answer 29

lol! :-D - good luck with them...

Answer 30

thx

Answer 31

is half perimeter of base multiply lenght=surface area

Answer 32

this very easy

Answer 33

@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 :-)

Answer 34

like we ALL were

Answer 35

yes right but this is the same like a rectangle curved on the base