Question

write the standard equation of each circle help please

Answer 1

Which problem?

Answer 2

31

Answer 3

http://www.mathwarehouse.com/geometry/circle/images/equation-of-circle/example-2-equation-of-circle.png

Answer 4

Look at the given graph
What's the coordinates of the center?

Answer 5

0,0

Answer 6

Good
Look at it again
What's th e distance between that center and any point on the circle?

Answer 7

using distance formula?

Answer 8

You may simply count the number of grids between center and the blue circle curve

Answer 9

2

Answer 10

Excellent
That's the radius

Answer 11

ok

Answer 12

So you have center and radius
Simply plug them in the standard form of circle

Answer 13

(x-h)^2+(y-k)^2=2^2

Answer 14

Yes
Replace h,k by the coordinates of center tio

Answer 15

(x-0)^2+(y-0)^2=4

Answer 16

Perfect

Answer 17

is that the answer

Answer 18

Yep that's it

Answer 19

can I give you the answers for 32-36 too make sure they are right

Answer 20

Hey still here?

Answer 21

yes

Answer 22

32. (x-0)^2+(y-0)^2=9
33. (x-0)^2+(y-3)^2=16
34. (x-2)^2+(y-0)^2=36
35. (x-2)^2+(y-2)^2=64
36.(x-1)^2+(y-1)^2=16

Answer 23

OK let me check

Answer 24

32 33 are correct

Answer 25

What's the radius of the circle in 34?

Answer 26

Remember radius must be measured from center to the blue circle curve

Answer 27

so ive done all those wrong :(

Answer 28

Radius is wrong yea

Answer 29

oh

Answer 30

33 also has wrong radius

Answer 31

Try again and see if you can tell me the radius of each

Answer 32

33. 2^2
34. 3^2
35. 4^2
36. 2^2

Answer 33

Looks great