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crystal1
Group Title
Dana plans to cover this model of a half moon completely with silver foil.
How many square centimeters of silver foil would Dana need to cover the model completely?
402.2
536.2
603.4
150.8
 2 years ago
 2 years ago
crystal1 Group Title
Dana plans to cover this model of a half moon completely with silver foil. How many square centimeters of silver foil would Dana need to cover the model completely? 402.2 536.2 603.4 150.8
 2 years ago
 2 years ago

This Question is Closed

trackzz Group TitleBest ResponseYou've already chosen the best response.0
Dude, this is a homework help site, do not ask for emails :P
 2 years ago

crystal1 Group TitleBest ResponseYou've already chosen the best response.0
its not and ur a player
 2 years ago

crystal1 Group TitleBest ResponseYou've already chosen the best response.0
true @trackzz
 2 years ago

campbell_st Group TitleBest ResponseYou've already chosen the best response.3
well the surface area of a hemisphere is \[SA = \frac{1}{2}(4pir^2) + \pi r^2\] and you have a radius of 8 cm just substitute and solve.
 2 years ago

crystal1 Group TitleBest ResponseYou've already chosen the best response.0
i dont know how to do that
 2 years ago

crystal1 Group TitleBest ResponseYou've already chosen the best response.0
cause i just see leters
 2 years ago

crystal1 Group TitleBest ResponseYou've already chosen the best response.0
@campbell_st
 2 years ago

campbell_st Group TitleBest ResponseYou've already chosen the best response.3
ok... do you have a calculator ?
 2 years ago

campbell_st Group TitleBest ResponseYou've already chosen the best response.3
ok you need to type in \[0.5 \times 4 \times \pi \times 8^2 + \pi \times 8^2\] that will give the answer to covering the hemisphere in foil..
 2 years ago

trackzz Group TitleBest ResponseYou've already chosen the best response.0
Alrii so basically what campbell has show you is the surface are of a sphere. Any problem in which they ask for something that wraps around a specific shape involves surface are. The surface area of a sphere is: 4 pi r^2 Where r is the radius of the sphere.
 2 years ago

crystal1 Group TitleBest ResponseYou've already chosen the best response.0
what is p 12.18 or 12.14
 2 years ago

trackzz Group TitleBest ResponseYou've already chosen the best response.0
If you're familiar with the button pi, it is the value of 3.14. Now for this particular question, it is a hemisphere. So half the surface are of the sphere. 1/2*(4pi r^2) = SA
 2 years ago

trackzz Group TitleBest ResponseYou've already chosen the best response.0
@crystal1 what are you talking about>
 2 years ago

trackzz Group TitleBest ResponseYou've already chosen the best response.0
you said:" what is p 12.18 or 12.14" what do you mean?
 2 years ago

crystal1 Group TitleBest ResponseYou've already chosen the best response.0
my bad sorry
 2 years ago

trackzz Group TitleBest ResponseYou've already chosen the best response.0
so you got the answer?
 2 years ago

crystal1 Group TitleBest ResponseYou've already chosen the best response.0
my answer is 5048.1152
 2 years ago

campbell_st Group TitleBest ResponseYou've already chosen the best response.3
nope... thats a long way from being correct
 2 years ago

campbell_st Group TitleBest ResponseYou've already chosen the best response.3
did you type in the equation I gave you as its written...?
 2 years ago

trackzz Group TitleBest ResponseYou've already chosen the best response.0
Shall we break it down Campbell? I think it's the BEDMAS
 2 years ago

trackzz Group TitleBest ResponseYou've already chosen the best response.0
Alright crystal, I want you to do r^2 first. Find the value of the radius squared.
 2 years ago

crystal1 Group TitleBest ResponseYou've already chosen the best response.0
yes i did @campbell_st
 2 years ago

campbell_st Group TitleBest ResponseYou've already chosen the best response.3
and tracks... I think you possible solution is missing the circular base... as the question talks about competely covering... it
 2 years ago

crystal1 Group TitleBest ResponseYou've already chosen the best response.0
you guys lost me now im confuse
 2 years ago

campbell_st Group TitleBest ResponseYou've already chosen the best response.3
ok... lets to it in little bits can you calculate \[0.5 \times 4 \times \pi \times 8^2\]
 2 years ago

trackzz Group TitleBest ResponseYou've already chosen the best response.0
Ok my bad, alrii yeah you're right. I'll leave this to Campbell. Dont wanna confuse you,
 2 years ago

campbell_st Group TitleBest ResponseYou've already chosen the best response.3
@crystal1 did you get an answer for the new calculation..?
 2 years ago

campbell_st Group TitleBest ResponseYou've already chosen the best response.3
what was the number..?
 2 years ago

crystal1 Group TitleBest ResponseYou've already chosen the best response.0
i dont reaally know im sorry im dumb i dont know how to start this thats why i need help
 2 years ago

trackzz Group TitleBest ResponseYou've already chosen the best response.0
You're not dumb. Tell yourself you're smart. You'll get the answer. Crystal, you got this. Wake up, look at what campbell wrote for you.
 2 years ago

crystal1 Group TitleBest ResponseYou've already chosen the best response.0
the answer is a
 2 years ago

trackzz Group TitleBest ResponseYou've already chosen the best response.0
you're not finished yet. Add the pi r^2 to what you got to get the answer
 2 years ago

campbell_st Group TitleBest ResponseYou've already chosen the best response.3
nope thats only the 1st part of the problem the curved surface has an area of 402.2 cm^2 now you need to find the area of the circular base... \[\pi \times 8^2\]
 2 years ago

campbell_st Group TitleBest ResponseYou've already chosen the best response.3
you need to calculate this number...
 2 years ago

campbell_st Group TitleBest ResponseYou've already chosen the best response.3
then the final answer will be \[402.2 + \pi \times 8^2 = \]
 2 years ago

campbell_st Group TitleBest ResponseYou've already chosen the best response.3
wow... nope not it lets make it easier what is \[\pi \times 8^2 =\]
 2 years ago

campbell_st Group TitleBest ResponseYou've already chosen the best response.3
nope still not right... \[\pi \times 8^2 = 201.1\]
 2 years ago

crystal1 Group TitleBest ResponseYou've already chosen the best response.0
how do you get thaat i tough that 8x2 its = 24
 2 years ago

campbell_st Group TitleBest ResponseYou've already chosen the best response.3
do you know how to square a number...
 2 years ago

campbell_st Group TitleBest ResponseYou've already chosen the best response.3
ok... then perhaps you need to ask you teacher... how to do the problem is you don't know the basics...
 2 years ago

crystal1 Group TitleBest ResponseYou've already chosen the best response.0
thnks you @campbell_st
 2 years ago
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