help area of shaded region

- anonymous

help area of shaded region

- Stacey Warren - Expert brainly.com

Hey! We 've verified this expert answer for you, click below to unlock the details :)

- schrodinger

I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!

- anonymous

@

##### 1 Attachment

- geerky42

Can you find area of semicircle?

- geerky42

Semicircle is just half the circle.
So it's like finding area of circle, but THEN you divide it by 2.

Looking for something else?

Not the answer you are looking for? Search for more explanations.

## More answers

- anonymous

yes that 4.71cm2

- anonymous

@geerky42

- anonymous

was that right @geerky42 ?

- anonymous

@Michele_Laino

- geerky42

No.

- geerky42

Area of circle is \(A = \pi r^2\)
So to find area of semicircle, you just use this formula then divide by 2.

- anonymous

but you said semi circle so wouldn't it be A=1/2pi r

- geerky42

My point is, to find semicircle, you just find area of circle, then divide by 2. Get it?
Also it's \(\pi r^2\), not just \(\pi r\).

- geerky42

So area of semicircle is \(\dfrac{\pi r^2}{2}\)

- anonymous

@geerky42 so 9.42cm2/2=4.71cm2

- geerky42

Radius is 3, so you have \(\dfrac{\pi(3)^2}{2} = \dfrac{9\pi}{2}\approx 14.137\)

- geerky42

Just remember that \(\pi\approx3.14\)

- anonymous

yes you told me that, thats how remember what pi is but how did you get the 9pi over 2

- geerky42

\(3^2 = 9\)

- geerky42

you divide 2 because semicircle

- geerky42

Is that clear?

- anonymous

yes kinda

- anonymous

thank you though @geerky42

- geerky42

Well, we are not done

- geerky42

we got area of semicircle. Now we need to subtract that by area of triangle

- geerky42

(Area of semicircle) - (Area of triangle)
Right?

- anonymous

yea

- geerky42

Ok. Area of triangle is \(\dfrac{1}{2}bh\)
Do you know base and height here?

- anonymous

but we don't have the area of the triangle so we need to solve for the triangle

- geerky42

Right.

- anonymous

so 3 would be our height

- anonymous

so how would you find the base given only the height

- geerky42

We don't really have to use height to find base.
Triangle and semicircle share same base, right?

- anonymous

yes

- anonymous

do the MAGIC! drawing thing geerky

- geerky42

We know that radius of semicircle is 3, so what is diameter?

- anonymous

:D

- anonymous

hahaaaa @camacho01erick that was the best response

- geerky42

lol. though I don't see the need to drawing something here lol.

- anonymous

1.5

- geerky42

maybe I will do magic thing once asker solve something like gif of victory lol.

- geerky42

@Mromanos96 No
\(d = 2r\), right?

- anonymous

k

- anonymous

yes

- anonymous

6

- geerky42

|dw:1433962650107:dw|

- anonymous

:0

- geerky42

Yeah so diameter is 6.
Therefore base of triangle is 6.
MAke sense so far?

- anonymous

yes so next we have 1/2 6*3

- geerky42

|dw:1433962764011:dw|

- geerky42

Sorry yesh that's correct.

- anonymous

lol funny ones

- geerky42

just laughing at ":0"

- anonymous

so thats 3/64 @geerky42 great gif btw

- anonymous

that kinda scares me

- anonymous

@camacho01erick it kinda does if you look at it for a little

- anonymous

ikr

- geerky42

|dw:1433962900186:dw|

- anonymous

how do you do that :D

- anonymous

:0 my favorite show man

- anonymous

@camacho01erick he's a wizard

- anonymous

fa fa fabulas

- geerky42

Anyway, no I got 9 for area of triangle

- geerky42

\(\dfrac{1}{2}*3*6 = 3*3 = 9\)

- geerky42

Right? @Mromanos96

- anonymous

how didi you do the gif @geerky42

- anonymous

ah how did you get that the only other one i got is a decimal

- geerky42

For area of triangle?

- geerky42

Did you use calculator?

- geerky42

I guess I need to make tutorial @camacho01erick in LaTeX section. I will tag you someday, I promise.

- anonymous

kk

- anonymous

yea

- anonymous

good thing i fanned you @geerky42

- geerky42

Well, put that in calculator 1/2 * 3 * 6

- geerky42

You should get 9, right?

- geerky42

lol @camacho01erick

- anonymous

yup

- anonymous

|dw:1433963336155:dw|

- anonymous

so 9cm^2

- geerky42

OK.
Now do final thing;
(Area of semicircle) - (Area of triangle)

- geerky42

We have \(14.137 - 9\)

- anonymous

we are /\tlas we will follow and we will not forget and will not forgive

- anonymous

5.137

- geerky42

Yep.
Sorry first area should be \(14.13\) since we have to use \(3.14\) for pi.
But anyways your final answer is \(\boxed{5.13~\text{cm}^2}\)

- geerky42

Is that clear so far?

- anonymous

yes crystal

- geerky42

ok good.

- anonymous

@geerky42 one last question

##### 1 Attachment

- geerky42

https://www.mathsisfun.com/data/relative-frequency.html

- geerky42

And here, voting registration status is irrelevant.

- geerky42

So we just need to find how many adult prefer newspapers
Then divide it by 252 (total)

- geerky42

Follow me so far?

- anonymous

yes

- geerky42

OK. how nay adults prefer newspaper?

- geerky42

how many*

- anonymous

46+24=70

- anonymous

hi

- anonymous

70 /252= 0.2

- geerky42

Correct.
So relative frequency is \(\dfrac{70}{252}=?\)

- geerky42

yeah but close. question said at least two decimal places.

- geerky42

So we have 70/252 = 2.777777777...
So round that to .28

- anonymous

0.27

- geerky42

That's your answer.

- anonymous

so it .28 not 0.28

- anonymous

|dw:1433964202516:dw|

- geerky42

Well it is closer to .28 than .27

- geerky42

0.28 and .28 are same

- anonymous

true

- anonymous

so really .28 or 0.28 because ales is very specific on it

- geerky42

I would go with 0.28

- anonymous

ok @geerky42 last one promise

##### 1 Attachment

- geerky42

|dw:1433964384649:dw|

- geerky42

sorry no need to use graph

- geerky42

But here, "input" is time spending in texting.
Here, you have x = 4
So plug that into best fit line \(y = -0.73x+8.53\)

- anonymous

5.61

- geerky42

\[y = -0.73(\bf\color{blue}4)+8.53\]

- geerky42

yeah 5.61 is your answer.

- anonymous

##### 1 Attachment

- anonymous

alright man thanks so much @geerky42

- geerky42

No problem

- anonymous

and um how do you do those gifs lol

- geerky42

|dw:1433964611059:dw|

- geerky42

I will make tutorial of it by tonight. Check tomorrow.

- anonymous

but how on drawing????

- geerky42

I will make tutorial later, I promise. Check tomorrow.

- geerky42

It's little complicated.

- anonymous

ok message us tommorow

- geerky42

I will tag. You want message anyway?

- anonymous

sure

- geerky42

What about you? Or nah? @Mromanos96

- anonymous

yeah tag me also

- geerky42

ok I will tag both you

- anonymous

geerky is a new moderator lol

- geerky42

I wish lol.

- anonymous

but how can you be a moderator anyways

- anonymous

a beginner have done it

- geerky42

You got to apply somewhere... I don't know because I was planning on doing that anyway lol.

- anonymous

|dw:1433964783733:dw|

- geerky42

You can ask that on OpenStudy feedback.

- anonymous

lol he'd be the number one

- geerky42

I wasn't planning*

- anonymous

i copyed yours lol

- geerky42

I can see that ;)

- anonymous

lol

- anonymous

we are /\tlas we will follow we will not forget and we will not forgive

- anonymous

bye

Looking for something else?

Not the answer you are looking for? Search for more explanations.