Question

@eSpeX I changed my circles and I am stuck on the ones blank. I will attach what I have so far.

Answer 1

After this I am working on the prisms for rectangles. I need to delete this attachments so people don't copy me. after we are done ok after I close it

Answer 2

My first question to you is, what is the formula for circumference?

Answer 3

other computer keeps freezing. ok it is 2 x pi (3.14) x r

Answer 4

area is pi x r ^2

Answer 5

Okay, and what can you rewrite 2r as?

Answer 6

volume is pi x r^2

Answer 7

as the dinomenator or circumference?

Answer 8

or am I confused?

Answer 9

Think more basic, what is twice the radius?

Answer 10

umm diameter??

Answer 11

are my answers so far right?

Answer 12

Exactly, so you can write your circumference as Dpi, look at your column of circumferences, what values do you have?

Answer 13

values? mm??

Answer 14

For your nickel you have: Circ = 21.2

Answer 15

Does that seem right?

Answer 16

2 x pi x r^2 + 2 x pi x h
to find the surface of half dollar ? with my numbers for it can you help me plug the numbers in then I will solve it? I just need to see the r^2 and h

Answer 17

is the circumference of the nickel 65.94 mm?

Answer 18

I got 66.602, but the difference could be due to rounding. You see however that it was not 21.2. :)

Answer 19

so I need to find the radius not the diamter to solve for circ for each. U sed the diam. not radius. yes I see how it wasn't correct.

Answer 20

is it all wrong for each column?

Answer 21

For the circumference, 2r pi, you can rewrite that is d pi, since the diameter is equal to 2r.

Answer 22

Yes, all of the circumferences need to be calculated again.

Answer 23

so I can use the given diam to find the circ by d x 3.14 = ?

Answer 24

See what I have done here? Look at the formulas, if you are going to use excel, let it work for you.

Answer 25

And yes, to your last question.

Answer 26

or should i just figure out the radius for each?

Answer 27

ok I yeah I want to use excel.

Answer 28

i am going too look at your attachment just sec

Answer 29

i tried to open your attachment but my computer crashed. Uggg let me try again

Answer 30

Nickel 66.568
Q = 76.3
half dollar = 94.5
dime = 56.206
penny = 61.23

for the circumferences right?

Answer 31

i couldn't pull up your attach : (

Answer 32

@eSpeX

Answer 33

Yes, you have all your circumferences correct now.

Answer 34

:)

Answer 35

Now what about your area, which implies the area of a face.

Answer 36

times it by 2?

Answer 37

In your cell, for the area of a nickel, you can put your formula in like this: =PI()*(24.26/2)^2

Answer 38

oops, that is the quarter. :)

Answer 39

oh ok thanks I will put it in

Answer 40

That is just the formula for an area of a circle. You are taking pi, and multiplying it by the diameter, divided by 2, squared.

Answer 41

for a cylinder?

Answer 42

two faces

Answer 43

I would interpret this to want the area of 1 face, because it also asks for the surface area, which is both faces and the edge.

Answer 44

ohh ok got it

Answer 45

ok think I have this wrong. I plugged in the numbers for area of nickel. I got this 104.51176

Answer 46

Pi x 66.568 / 2

Answer 47

squared

Answer 48

The area of a nickel should be pi, times 21.2/2, squared. Where did you get 66.568?

Answer 49

I used the calculation form diam.

Answer 50

66.568 is the circumference. Not something you can use in that formula you typed.

Answer 51

Pi x 21.2 /2 equal 33.284

Answer 52

what are the formulas for surface area and volume if I need to redo all ?

Answer 53

21.2 is your diameter (d), your radius (r) is 1/2 of 'd'.
You don't need to redo all, you have the formulas, look at them and verify the number you are using.

Answer 54

I have to head out for a bit but I will be back later this afternoon. Work on these, you have everything you need, just slow down and think about each variable and what it means.

Answer 55

ok thanks so much! I will tag if after I am completely done if you can take one last look at them when I tag you?

Answer 56

This is really just an exercise in plugging and chugging.

Answer 57

ok thank you!!!