anonymous
  • anonymous
Find the area of the shaded sector below.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
1 Attachment
anonymous
  • anonymous
Find the area of the circle and divide it by 6
anonymous
  • anonymous
Hint: The answer is 9pi/6

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anonymous
  • anonymous
Where did you get the 9 and 6 from ?
anonymous
  • anonymous
Find the area of the circle.
anonymous
  • anonymous
i got 4.71
anonymous
  • anonymous
In terms of pi
anonymous
  • anonymous
47.1 ? -__ -
anonymous
  • anonymous
i don't know actually.
anonymous
  • anonymous
Your answer will be cPI, where c is a number.
anonymous
  • anonymous
Remember the area of a circle is pi*r^2
anonymous
  • anonymous
9.42 for cPI and 11309.73 for pi*r^2 ?
anonymous
  • anonymous
For r would i use the degree or the number ?
anonymous
  • anonymous
what does r stand for in the equation for the area of a circle?
anonymous
  • anonymous
radius correct
anonymous
  • anonymous
Yep so square the radius and then multiply that by pi then divide that by the region of the circle it is which is 1/6
anonymous
  • anonymous
9pi/6 = 4.71
anonymous
  • anonymous
?
anonymous
  • anonymous
Yes sir
anonymous
  • anonymous
Oh i forgot to ask would it be cm square or cm ?
anonymous
  • anonymous
Also do i always divide by 6 ?
anonymous
  • anonymous
Oh you got 6 by dividing 360 by 60 right
jim_thompson5910
  • jim_thompson5910
60 degrees is 60/360 = 1/6 of a full revolution (360 degrees) so the area of the sector will be 1/6 of the area of the full circle so that's why you're dividing by 6 (in this case)
anonymous
  • anonymous
Oh okay i think i get it now, can i put another question up and you tell me if i solved it right ?
jim_thompson5910
  • jim_thompson5910
you basically find the area of the full circle (using A = 2pi*r) then you divide by 6 sure go for it
anonymous
  • anonymous
Hold on do i add square cm or just cm to 4.71 ?
jim_thompson5910
  • jim_thompson5910
linear units are units like inches, centimeters, etc
jim_thompson5910
  • jim_thompson5910
they measure distance and length
jim_thompson5910
  • jim_thompson5910
area units are units like square inches, square centimeters, and so on
jim_thompson5910
  • jim_thompson5910
so you add on square cm (not just cm)
anonymous
  • anonymous
Thank i was getting confused with that (:
jim_thompson5910
  • jim_thompson5910
np
anonymous
  • anonymous
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anonymous
  • anonymous
^ that would be 6cm2 or would i just be 6 cm ?
anonymous
  • anonymous
it *
jim_thompson5910
  • jim_thompson5910
the area is in square meters (given) so the area stays in square meters (unless you convert)
jim_thompson5910
  • jim_thompson5910
so 6 m^2
anonymous
  • anonymous
THis is the last one.
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jim_thompson5910
  • jim_thompson5910
find the total area multiply it by 275/360, since you're taking only this fraction of the area (and not the whole thing)
anonymous
  • anonymous
i got 1.31
jim_thompson5910
  • jim_thompson5910
way too small
anonymous
  • anonymous
No i got that for 275/360 ahahaha
jim_thompson5910
  • jim_thompson5910
oh, that should be some number less than 1 then
jim_thompson5910
  • jim_thompson5910
you divided in the wrong order
anonymous
  • anonymous
360/275 = 1.31
anonymous
  • anonymous
is that one right ?
jim_thompson5910
  • jim_thompson5910
flip the fraction, the 275 should be on top
anonymous
  • anonymous
oh 0.76
jim_thompson5910
  • jim_thompson5910
yep 275/360 = 0.763888 then you take that result and multiply it with the total area of the circle
anonymous
  • anonymous
64*0.76*Pi
anonymous
  • anonymous
152.73 would be my answer
jim_thompson5910
  • jim_thompson5910
yes approximately
jim_thompson5910
  • jim_thompson5910
a closer approximation is 153.511111111111
jim_thompson5910
  • jim_thompson5910
the difference is due to round-off error
jim_thompson5910
  • jim_thompson5910
and the fact that pi is approximate in itself
anonymous
  • anonymous
Oh right the hundredths place is the third right or is it the four i'm really slow today -__ -
jim_thompson5910
  • jim_thompson5910
it goes tenths hundredths thousandths ten-thousandths ... ... so it's the second digit after the decimal point
anonymous
  • anonymous
Left or right, sorry you must think i lack brain cells.
anonymous
  • anonymous
Ahahaha you answered it, i'm really not getting anything today it's on the right
jim_thompson5910
  • jim_thompson5910
that's ok, just take things one step at a time
anonymous
  • anonymous
Okay i'm going to try to solve this one
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anonymous
  • anonymous
145/360 = 0.40 * 3.14 * 3.7squared
anonymous
  • anonymous
17.2 square cm
anonymous
  • anonymous
inches *
jim_thompson5910
  • jim_thompson5910
you round to 2 places (not 1)
anonymous
  • anonymous
17.3 inches ?
jim_thompson5910
  • jim_thompson5910
2 decimal places (ie 2 digits after the decimal point)
anonymous
  • anonymous
19.20 inches
jim_thompson5910
  • jim_thompson5910
you should have gotten (145/360)*3.14*3.7^2 = 17.3140472222222 = 17.31
jim_thompson5910
  • jim_thompson5910
so 17.31 is what they're looking for
anonymous
  • anonymous
Oh you just multiply 3.7 by two i thought i had to multiply it by itself .
jim_thompson5910
  • jim_thompson5910
3.7^2 means 3.7*3.7
jim_thompson5910
  • jim_thompson5910
it means 3.7 squared 3.7^2 = 3.7 squared
jim_thompson5910
  • jim_thompson5910
if i wanted to say "3.7 times 2" then I would write 3.7 * 2
anonymous
  • anonymous
I did it how you said to do it but i got 17.20
jim_thompson5910
  • jim_thompson5910
hmm
jim_thompson5910
  • jim_thompson5910
maybe you typed it differently
anonymous
  • anonymous
Okay you know how you divide 146 by 360 how many numbers after 0. i'm suppose to use i only use two after 0. example 0.10 get me ?
jim_thompson5910
  • jim_thompson5910
i think so
jim_thompson5910
  • jim_thompson5910
so instead of using 0.40277777777778 you can only use 0.40
anonymous
  • anonymous
Then i don't know why i'm getting it wrong, maybe i'm not meant to pass geometry.
jim_thompson5910
  • jim_thompson5910
what answer is it saying is wrong?
anonymous
  • anonymous
No but i'm not getting what you get so i'm obviously doing something wrong.
jim_thompson5910
  • jim_thompson5910
well I just typed it all at once
jim_thompson5910
  • jim_thompson5910
instead of breaking it up
jim_thompson5910
  • jim_thompson5910
i typed all of (145/360)*3.14*3.7^2 at once
jim_thompson5910
  • jim_thompson5910
don't forget to round to two places
anonymous
  • anonymous
OH ! i don't do that, how brain dead of me.
anonymous
  • anonymous
Yes i finally got it !!! 17.314
jim_thompson5910
  • jim_thompson5910
well you want 2 dec places
anonymous
  • anonymous
Which makes it 17.31
jim_thompson5910
  • jim_thompson5910
yep
anonymous
  • anonymous
I know i was just trying to show you that i finally got it down, thank you so much you basically brought me back from hell and that i will never forget.
jim_thompson5910
  • jim_thompson5910
geometry isn't hell, so I didn't bring you back from there lol
jim_thompson5910
  • jim_thompson5910
but I can see how it's tough
anonymous
  • anonymous
Can it be because i'm stressing that i'm not get the things right away ?
anonymous
  • anonymous
getting*
jim_thompson5910
  • jim_thompson5910
that's definitely something that may make you not think straight
jim_thompson5910
  • jim_thompson5910
so just take things one step at a time and it'll start to click better
anonymous
  • anonymous
Okay have a nice day and your the best j. (:
jim_thompson5910
  • jim_thompson5910
you too
anonymous
  • anonymous
you're *

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