anonymous
  • anonymous
multiple choice question
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
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anonymous
  • anonymous
hi do you know the formula for the surface area and lateral area of these two solids?
anonymous
  • anonymous
no

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anonymous
  • anonymous
oh ok,,you can look in the web...look for the lateral surface area of cylinder, then the surface area of it..do u wanna do that first?
anonymous
  • anonymous
not really cuz my computer is slow and i cant open another tab
anonymous
  • anonymous
ok for the prism first,, SA = 2(LW+HL+HW) ..... L= LENGTH, H=HEIGHT, W=WIDTH FOR THE CYLINDER SA=2piR^2+2PiRH ....pi=3.1416 , r=radius h=height of cylinder
anonymous
  • anonymous
#8 would be b #9 would be a
anonymous
  • anonymous
did you try solving it first?
anonymous
  • anonymous
no
anonymous
  • anonymous
for the cylinder the surface area would be 471
anonymous
  • anonymous
lets try it...for cyllinder sa=2pi rh=2*3.1416*2.5*10=50pi=50*3.1416=157.079
anonymous
  • anonymous
i got 471 2*3.14*5^2+2*3.14*5*10 157+314=471
anonymous
  • anonymous
for prism is that 6 and 4? or 8 and 4?
anonymous
  • anonymous
prism is 6 and 4
anonymous
  • anonymous
yes im sorry, ok you are right, i was solving for lateral area
anonymous
  • anonymous
ok
anonymous
  • anonymous
so this 157.079 is the lateral area of the cylinder
anonymous
  • anonymous
for lateral area of prism is 4x5+4x5+4x4+4x6=?
anonymous
  • anonymous
3000
anonymous
  • anonymous
ok which is greater? for lateral area
anonymous
  • anonymous
prism
anonymous
  • anonymous
wait that is 20+20+16+24=80 did you see it?
anonymous
  • anonymous
yea.. i acidiantly did it all together
anonymous
  • anonymous
so the cylinder for lateral area
anonymous
  • anonymous
yes then try for SA for the other one
anonymous
  • anonymous
the SA for the cylinder is 471
anonymous
  • anonymous
how do i find the SA for the prism?
anonymous
  • anonymous
wait for cyl, use r=2.5 instead of diameter=10
anonymous
  • anonymous
sorry i mean use r=2.5 not d=5
anonymous
  • anonymous
r=5 h=10
anonymous
  • anonymous
d=5 r=2.5 h=10
anonymous
  • anonymous
i though d was id the line went all the way across
anonymous
  • anonymous
d=diameter of the circumference of the circle. r=radius of the circle
anonymous
  • anonymous
r=d/2
anonymous
  • anonymous
SA=196.25
anonymous
  • anonymous
CYL SA=2*3.1416*2.5^2 +2*3.1416*2.5*10=196.35 APPROX
anonymous
  • anonymous
ok
anonymous
  • anonymous
FOR PRISM ITS THE 2 TOP COVER PLUS THE LATERAL AREA
anonymous
  • anonymous
80+4+5
anonymous
  • anonymous
89
anonymous
  • anonymous
PRISM SA=2(24+20+30)=148
anonymous
  • anonymous
so this one would be A
anonymous
  • anonymous
OK,,,,GOOD LUCK
anonymous
  • anonymous
thanks
anonymous
  • anonymous
WC

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