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Mathematics 10 Online
OpenStudy (here_to_help15):

Help does this look correct?

OpenStudy (here_to_help15):

@amistre64 is this correct?

OpenStudy (amistre64):

whats the area of the whole circle it is a part of?

OpenStudy (here_to_help15):

I dont know someone really didnt explain it to me

OpenStudy (amistre64):

you dont know how to find the area of a circle?

OpenStudy (here_to_help15):

They just blurted it and i dont believe there correct

OpenStudy (here_to_help15):

Oh yes! i do lol

OpenStudy (amistre64):

we have 168 out of 360 of a circle to deal with .. so thats the proportion of area as well 168/360 * pi r^2

OpenStudy (here_to_help15):

\[\pi r ^{2}\]

OpenStudy (amistre64):

64pi is the total, we want 168/360 th of it

OpenStudy (here_to_help15):

th?

OpenStudy (amistre64):

th .. th .. thhhh .. 1/4th 1/5th 1/8th .. th

OpenStudy (here_to_help15):

oh lol

OpenStudy (here_to_help15):

So how would i do that

OpenStudy (amistre64):

what is 168/360 * pi r^2 ?

OpenStudy (here_to_help15):

Im sorry @amistre64 but i dont know

OpenStudy (amistre64):

what is 168/360? i cant do the math for you ...

OpenStudy (here_to_help15):

as a decimal

OpenStudy (amistre64):

sure

OpenStudy (here_to_help15):

Ok one sec

OpenStudy (here_to_help15):

0.47

OpenStudy (amistre64):

more decies .46667 now multiply by pi

OpenStudy (here_to_help15):

1.47?

OpenStudy (here_to_help15):

1.46607657168

OpenStudy (amistre64):

1.466 yeah, now multiply by r and then by r agian

OpenStudy (here_to_help15):

which is 8 correct?

OpenStudy (amistre64):

r=8 yes

OpenStudy (here_to_help15):

So it is A! :)

OpenStudy (amistre64):

yes

OpenStudy (here_to_help15):

OpenStudy (here_to_help15):

Couple more please?

OpenStudy (amistre64):

if 12am, im heading to bed so just this last one what is lateral area?

OpenStudy (here_to_help15):

I dont know sorry

OpenStudy (amistre64):

its your vocabulary, not mine

OpenStudy (here_to_help15):

lol

OpenStudy (amistre64):

prisms consist of 2 basic parts ... bases and sides

OpenStudy (here_to_help15):

Ok

OpenStudy (amistre64):

lateral means side

OpenStudy (amistre64):

if we "unwrap" the sides, we have a rectangle. its width is the perimeter of the base, and its height is .... its heaigh

OpenStudy (here_to_help15):

ok

OpenStudy (amistre64):

surface area is lateral + bases

OpenStudy (here_to_help15):

Oh ok

OpenStudy (amistre64):

im out ... goodluck

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