Question

Area question?

Answer 1

You wouldn't happen to know the equation for the area of a cylinder, would you?

Answer 2

you mean surface area?

Answer 3

Ah, it wants surface area?

Answer 4

no it wants how many of the lids of the tin are able to be crafted from 0.5m2 of metal

Answer 5

So you dont need the first part where it shows the cylinder, only the lid cutting portion?

Answer 6

yeah i just showed the cylinder so people could see the lid

Answer 7

Oh, okay. Well, if we want to know about lids, then we only need to know the area of the top of the cylinder, so basically we'd be using the formula for the area of a circle.

Answer 8

yeah so i got 44.17864669 for the area

Answer 9

then i got 0.5m2 as the total area for the rectangle metal sheet. and its converted to 5000cm2

Answer 10

then i divided 5000 by 44.17864669 which got me 113

Answer 11

Right. That would work, but the question might be expecting you to answer in another way:



As in they have waste and they only cut out perfectly circular portions. Which means the area won't matter and only the diameter of the circle and the length of the metal sheet.

Answer 12

oh i see thanks

Answer 13

Yeah. So we have one length that is 500 cm and we have our diameter of 7.5cm. That means the maximum that we can fit along that length would be 66. So obviously the answer is way different thinking of it like this. So one length of the sheet can have 66 because 500/7.5 = 66.67. Now the other length is a full 1000cm, so if we divide that by 7.5, we get 133.33 or basically 133. So what this means is we can have 66 rows of 133 lids, or 133 times 66.

Answer 14

sheet is 0.5m wide =50cm
and diameter of lid=7.5cm
no. of lids=50/7.5=6
length of sheet=1m=100 cm
no. of lids=100/7.5=13
Total no. of lids out of one sheet=13*6=78