Find the area of the shaded sector below.

- anonymous

Find the area of the shaded sector below.

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- anonymous

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- anonymous

Find the area of the circle and divide it by 6

- anonymous

Hint: The answer is 9pi/6

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## More answers

- anonymous

Where did you get the 9 and 6 from ?

- anonymous

Find the area of the circle.

- anonymous

i got 4.71

- anonymous

In terms of pi

- anonymous

47.1 ? -__ -

- anonymous

i don't know actually.

- anonymous

Your answer will be cPI, where c is a number.

- anonymous

Remember the area of a circle is pi*r^2

- anonymous

9.42 for cPI and 11309.73 for pi*r^2 ?

- anonymous

For r would i use the degree or the number ?

- anonymous

what does r stand for in the equation for the area of a circle?

- anonymous

radius correct

- 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

9pi/6 = 4.71

- anonymous

?

- anonymous

Yes sir

- anonymous

Oh i forgot to ask would it be cm square or cm ?

- anonymous

Also do i always divide by 6 ?

- anonymous

Oh you got 6 by dividing 360 by 60 right

- 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

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

you basically find the area of the full circle (using A = 2pi*r)
then you divide by 6
sure go for it

- anonymous

Hold on do i add square cm or just cm to 4.71 ?

- jim_thompson5910

linear units are units like inches, centimeters, etc

- jim_thompson5910

they measure distance and length

- jim_thompson5910

area units are units like square inches, square centimeters, and so on

- jim_thompson5910

so you add on square cm (not just cm)

- anonymous

Thank i was getting confused with that (:

- jim_thompson5910

np

- anonymous

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- anonymous

^ that would be 6cm2 or would i just be 6 cm ?

- anonymous

it *

- jim_thompson5910

the area is in square meters (given)
so the area stays in square meters (unless you convert)

- jim_thompson5910

so 6 m^2

- anonymous

THis is the last one.

##### 1 Attachment

- 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

i got 1.31

- jim_thompson5910

way too small

- anonymous

No i got that for 275/360 ahahaha

- jim_thompson5910

oh, that should be some number less than 1 then

- jim_thompson5910

you divided in the wrong order

- anonymous

360/275 = 1.31

- anonymous

is that one right ?

- jim_thompson5910

flip the fraction, the 275 should be on top

- anonymous

oh 0.76

- jim_thompson5910

yep
275/360 = 0.763888
then you take that result and multiply it with the total area of the circle

- anonymous

64*0.76*Pi

- anonymous

152.73 would be my answer

- jim_thompson5910

yes approximately

- jim_thompson5910

a closer approximation is 153.511111111111

- jim_thompson5910

the difference is due to round-off error

- jim_thompson5910

and the fact that pi is approximate in itself

- anonymous

Oh right the hundredths place is the third right or is it the four i'm really slow today -__ -

- jim_thompson5910

it goes
tenths
hundredths
thousandths
ten-thousandths
...
...
so it's the second digit after the decimal point

- anonymous

Left or right, sorry you must think i lack brain cells.

- anonymous

Ahahaha you answered it, i'm really not getting anything today it's on the right

- jim_thompson5910

that's ok, just take things one step at a time

- anonymous

Okay i'm going to try to solve this one

##### 1 Attachment

- anonymous

145/360 = 0.40 * 3.14 * 3.7squared

- anonymous

17.2 square cm

- anonymous

inches *

- jim_thompson5910

you round to 2 places (not 1)

- anonymous

17.3 inches ?

- jim_thompson5910

2 decimal places (ie 2 digits after the decimal point)

- anonymous

19.20 inches

- jim_thompson5910

you should have gotten
(145/360)*3.14*3.7^2 = 17.3140472222222 = 17.31

- jim_thompson5910

so 17.31 is what they're looking for

- anonymous

Oh you just multiply 3.7 by two i thought i had to multiply it by itself .

- jim_thompson5910

3.7^2 means 3.7*3.7

- jim_thompson5910

it means 3.7 squared
3.7^2 = 3.7 squared

- jim_thompson5910

if i wanted to say "3.7 times 2"
then I would write 3.7 * 2

- anonymous

I did it how you said to do it but i got 17.20

- jim_thompson5910

hmm

- jim_thompson5910

maybe you typed it differently

- 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

i think so

- jim_thompson5910

so instead of using 0.40277777777778 you can only use 0.40

- anonymous

Then i don't know why i'm getting it wrong, maybe i'm not meant to pass geometry.

- jim_thompson5910

what answer is it saying is wrong?

- anonymous

No but i'm not getting what you get so i'm obviously doing something wrong.

- jim_thompson5910

well I just typed it all at once

- jim_thompson5910

instead of breaking it up

- jim_thompson5910

i typed all of (145/360)*3.14*3.7^2 at once

- jim_thompson5910

don't forget to round to two places

- anonymous

OH ! i don't do that, how brain dead of me.

- anonymous

Yes i finally got it !!! 17.314

- jim_thompson5910

well you want 2 dec places

- anonymous

Which makes it 17.31

- jim_thompson5910

yep

- 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

geometry isn't hell, so I didn't bring you back from there lol

- jim_thompson5910

but I can see how it's tough

- anonymous

Can it be because i'm stressing that i'm not get the things right away ?

- anonymous

getting*

- jim_thompson5910

that's definitely something that may make you not think straight

- jim_thompson5910

so just take things one step at a time and it'll start to click better

- anonymous

Okay have a nice day and your the best j. (:

- jim_thompson5910

you too

- anonymous

you're *

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