Question

Margaret traces a circle with a radius of 20 cm like the one shown below. She will color the shaded region. What is the approximate area of the shaded region?

Answer 1

smr_kml, could you please help me?

Answer 2

I don't understand the problem?

Answer 3

you have to find the area of the shaded region of the circle above

Answer 4

sorry i forgot to shade it in when i drew it.

Answer 5

Btw I'll become anyone who helps me's fan.

Answer 6

Do you have any laws to use?

Answer 7

The area of the shaded region is \[\pi r^2\]Your r is 20, so r^2=400. Now, pi is approx. 3.1, so the approximate area is 400*3.1=1240 cm^2.

Answer 8

Why pi = 3.1 ? blockcolder?

Answer 9

I know that pi = 22/7 or 3.14

Answer 10

yes, its 3.14

Answer 11

It's just an approximation I used to make the multiplication easier. :D

Answer 12

I think you have to divide the total area by 4 because it's quarter of a circle not the whole circle

Answer 13

I have a question, isnt pi r 2 the formula for the area of the circle?

Answer 14

Oh. I thought the shaded area was the whole circle. :P

Answer 15

No

Answer 16

no, just were it says 20 cm

Answer 17

Right. So you need to divide my answer by 4.

Answer 18

pi r 2 / 4?

Answer 19

But I'm not sure if this area is a quarter of the circle or what?

Answer 20

yes, a quarter.

Answer 21

1240/4 = 314.28 cm2

Answer 22

Yes, that one. :D

Answer 23

it was like this.

Answer 24

So yes that's right horsesrock

Answer 25

ok, thanks, smr.

Answer 26

do i write the whole thing, like you typed it?

Answer 27

314.28?

Answer 28

yes you have to write the whole area and then divide it by 4

Answer 29

ok. thanks.

Answer 30

you're welcome

Answer 31

For helping me.

Answer 32

'm going to"fan" you.

Answer 33

oh thanks

Answer 34

:D as a "thank you".

Answer 35

no prob ;D

Answer 36

I just dif, as a matter of fact.

Answer 37

did*

Answer 38

I will also write a testimonial

Answer 39

ok great

Answer 40

can you message me?