Question

How do you find the answer?? Need explaining please

Answer 1

I have multiple questions like this so if someone can explain how to find this one, that should help with the rest. Thanks : )

Answer 2

\(\bf \textit{Sector of a Circle Area}=\cfrac{\theta \pi r^2}{360}
\)

Answer 3

you have the angle, and the radius, just plug them in

Answer 4

Would that be 7,536/360 then?

Answer 5

Which equals = 20.93

Answer 6

well, I got 29.30 which is what I think you meant :)

Answer 7

\(\bf \cfrac{210\cdot 3.14\cdot 210}{360}\)

Answer 8

hmm...

Answer 9

\(\bf \cfrac{210\cdot 3.14\cdot 4^2}{360}\) rather

Answer 10

Where does the 210 come from?

Answer 11

Sorry, I don't think we've gotten this far yet in class

Answer 12

the non-shaded Area has an angle of 150 degrees
the shaded Area will be 360 - 150

Answer 13

Oh okay, I see

Answer 14

you seem to have done the non-shaded area, correctly btw
but you're asked only for the shaded area :)

Answer 15

I got 20.93 as well, rounded it and that's one of the answer choices. : )

Answer 16

yes, heheh, but not the shaded one =)

Answer 17

This is the other question similar to this one. I'm going to see if I can do it

Answer 18

360 - 150 = 210
So 210 X 3.14 X 36 (radius squared) = 23,738.4
Divide by 360 and I got... 65.94
It's one of the answer choices. Is that right?

Answer 19

same thing, different "r"

Answer 20

yeap

Answer 21

\(\bf \cfrac{210\cdot 3.14\cdot 36}{360}=65.94\)

Answer 22

YESSSSSS :DD
Thank you
I also need to know how to find this: Last one, sorry.

Answer 23

do you know what the Area of a Circle is? equation wise that is

Answer 24

http://wme.cs.kent.edu/kimpton/img/cirarea.gif

Answer 25

Pi r squared?

Answer 26

Yeah

Answer 27

so we know the Area of this circle is \(144\pi\ cm^2\) so what's the radius? we dunno

but we know that \(\bf \textit{Area of a Circle}=\pi r^2\\ \quad \\
144\pi=\pi r^2\implies \sqrt{\cfrac{144\pi}{\pi}}=r\)

now that have gotten the radius of the circle, use that in the Sector of Circle Area equation, just like before

Answer 28

@jdoe0001 I got 25.12

Answer 29

hmm sorry I was caught up a bit....

Answer 30

\(\bf \sqrt{\cfrac{144\pi}{\pi}}=r\implies \sqrt{144}=r\implies 12=r\qquad thus\ \quad \\

\cfrac{12^2\cdot 3.14\cdot 120}{360}\)

Answer 31

That's okay..So we square the radius again? 144 x pi x 120
I thought we just used 12


So what I did was subtracted 120 from 360 = 240
So I did the radius 12 X 3.14 X 240 and divided the answer by 360 and I got 25.12

Answer 32

\(\bf \textit{Sector of a Circle Area}=\cfrac{\theta \pi \color{red}{r^2}}{360}\)

Answer 33

I was just using the method from earlier on the other questions

Answer 34

Ohh I see now!