Question

plz help me i nned is bad if your good at area of a circle help!!

Answer 1

whats the question?

Answer 2

Find the area of a circle with a radius of \color{purple}{3}3start color purple, 3, end color purple.

Answer 3

ignore the its purple dont know why it do that

Answer 4

i need 5 in aa row if i miss one it starts over

Answer 5

So find the area of a circle wit radius 3?

Answer 6

plz no direct answer

Answer 7

yes how do i do that?

Answer 8

The circle area formula is pi*r^2 where r is the radius

Answer 9

Does it want you to approximate pi?

Answer 10

so its pi*6

Answer 11

3^2 isn't 6

Answer 12

18.84

Answer 13

9

Answer 14

28.26

Answer 15

is what i got

Answer 16

So the answer would be 9pi.

Answer 17

oh cool is that how i doit?

Answer 18

If you have to approximate pi as 3.14 then it would be 28.26.

Answer 19

So you were right.

Answer 20

so how did u get the 2?

Answer 21

That means squared.

Answer 22

3 squared=9

Answer 23

yes i know how did u get it

Answer 24

Just the formula.

Answer 25

so i use 2 squared for them all

Answer 26

You use the formula pi*r^2.

Answer 27

For whatever the radius happens to be.

Answer 28

next one find the area of a circle with radious of 7

Answer 29

So just plug in 7 into the formula.

Answer 30

so this one is pi*7squared 2

Answer 31

(Just a note when you say squared you don't need to put a 2 at the end ^2=squared)

Answer 32

so 7x7is 49pi

Answer 33

Yes.

Answer 34

thanks stay here a second

Answer 35

Find the area of a circle with a circumference of 12 pi last one i belive

Answer 36

Okay so if you are given the circumference then you have to figure out the radius. The formula for the circumference of a circle is 2r*pi (more commonly 2pi*r but it is the same). So we have 2r*pi=12pi. Just solve that.

Answer 37

radios squared2

Answer 38

Solve 2r*pi=12pi

Answer 39

1 1/2

Answer 40

Divide by pi to get 2r=12.

Then divide by 2 to get r=12/2=?

Answer 41

6

Answer 42

so its dividing pi both sides

Answer 43

So 6 is the radius. Now plugging that into the area formula (pi*r^2) you get...?

Answer 44

12

Answer 45

6^2=6*6=36

36*pi=36pi

Answer 46

oh sry the squared always throws me off sorry

Answer 47

same thing but with 16
so its 2r*pi=16?

Answer 48

Yes.

Answer 49

BTW does it ask to approximate pi?

Answer 50

ok im s try it correct me if im wrong um no 36 pi was correct answer

Answer 51

so divide by pi

Answer 52

so its 2r=16?

Answer 53

Okay. Yes. So we get 2r=16

Answer 54

Which means r=?

Answer 55

pi

Answer 56

r=8 (divide 16 by 2)

Answer 57

then i divide by 2

Answer 58

so its 16/2=8

Answer 59

8squared 2 is 64

Answer 60

Yes. Now then plug 8 into the area formula to get...?

Answer 61

Sniped. Yes you are correct.

Answer 62

Just multiply 64 by pi to get 64pi.

Answer 63

yes ok thxs can u come up with another one plz?

Answer 64

k

Answer 65

If you are having trouble with circles this is a good place to look: https://www.mathsisfun.com/geometry/circle.html

Answer 66

ok thanks

Answer 67

thanks to u you probly saved my straight a's

Answer 68

ok how do i find diameter

Answer 69

find area of cirle with a diameter of 8

Answer 70

the diameter equals 2r (diameter is double the radius)

Answer 71

So what is the radius if the diameter is 8?

Answer 72

4

Answer 73

sry taking notes on the stuff above

Answer 74

Okay. So the area of the circle is...?

Answer 75

4?

Answer 76

8 is the area

Answer 77

remember it is pi*r^2 (it might be better for you to remember it as pi*r*r

Answer 78

no this is diameter not radious

Answer 79

Find the area of a circle with a diameterof 8

Answer 80

is the question

Answer 81

To solve you have to find the radius first and we figured out that the radius is 4.

Answer 82

So what is the area?

Answer 83

16 pi is the answer i got it

Answer 84

ok thanks for all help i will medal an fan u

Answer 85

Good job!

Answer 86

@Bill_Cipher

Answer 87

Find the arc length of the semicircle

Answer 88

what semicircle?

Answer 89

its 8

Answer 90

it looks like a bow an where the string would its 8

Answer 91

So like this: