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Mathematics 77 Online
OpenStudy (anonymous):

multiple choice question

OpenStudy (anonymous):

OpenStudy (anonymous):

hi do you know the formula for the surface area and lateral area of these two solids?

OpenStudy (anonymous):

no

OpenStudy (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?

OpenStudy (anonymous):

not really cuz my computer is slow and i cant open another tab

OpenStudy (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

OpenStudy (anonymous):

#8 would be b #9 would be a

OpenStudy (anonymous):

did you try solving it first?

OpenStudy (anonymous):

no

OpenStudy (anonymous):

for the cylinder the surface area would be 471

OpenStudy (anonymous):

lets try it...for cyllinder sa=2pi rh=2*3.1416*2.5*10=50pi=50*3.1416=157.079

OpenStudy (anonymous):

i got 471 2*3.14*5^2+2*3.14*5*10 157+314=471

OpenStudy (anonymous):

for prism is that 6 and 4? or 8 and 4?

OpenStudy (anonymous):

prism is 6 and 4

OpenStudy (anonymous):

yes im sorry, ok you are right, i was solving for lateral area

OpenStudy (anonymous):

ok

OpenStudy (anonymous):

so this 157.079 is the lateral area of the cylinder

OpenStudy (anonymous):

for lateral area of prism is 4x5+4x5+4x4+4x6=?

OpenStudy (anonymous):

3000

OpenStudy (anonymous):

ok which is greater? for lateral area

OpenStudy (anonymous):

prism

OpenStudy (anonymous):

wait that is 20+20+16+24=80 did you see it?

OpenStudy (anonymous):

yea.. i acidiantly did it all together

OpenStudy (anonymous):

so the cylinder for lateral area

OpenStudy (anonymous):

yes then try for SA for the other one

OpenStudy (anonymous):

the SA for the cylinder is 471

OpenStudy (anonymous):

how do i find the SA for the prism?

OpenStudy (anonymous):

wait for cyl, use r=2.5 instead of diameter=10

OpenStudy (anonymous):

sorry i mean use r=2.5 not d=5

OpenStudy (anonymous):

r=5 h=10

OpenStudy (anonymous):

d=5 r=2.5 h=10

OpenStudy (anonymous):

i though d was id the line went all the way across

OpenStudy (anonymous):

d=diameter of the circumference of the circle. r=radius of the circle

OpenStudy (anonymous):

r=d/2

OpenStudy (anonymous):

SA=196.25

OpenStudy (anonymous):

CYL SA=2*3.1416*2.5^2 +2*3.1416*2.5*10=196.35 APPROX

OpenStudy (anonymous):

ok

OpenStudy (anonymous):

FOR PRISM ITS THE 2 TOP COVER PLUS THE LATERAL AREA

OpenStudy (anonymous):

80+4+5

OpenStudy (anonymous):

89

OpenStudy (anonymous):

PRISM SA=2(24+20+30)=148

OpenStudy (anonymous):

so this one would be A

OpenStudy (anonymous):

OK,,,,GOOD LUCK

OpenStudy (anonymous):

thanks

OpenStudy (anonymous):

WC

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