Question

help

Answer 1

which of the following is the equation of a circle with center(5,2) and a radius of 3?

Answer 2

(x-5)^2+(y+2)^2=9
(x+5)^2+(y-2)^2=9
(x-5)^2+(y+2)^2=3
(x+5)^2+(y-2)^2=3

Answer 3

the general equation is

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

where h = your x-coordinate, k = your y-coordinate, and r = radius

Answer 4

so in your case, h = 5, k = 2, and r = 3

Answer 5

plug in those numbers into the equation and let me know what you get

Answer 6

which of the following us the equation of the circle shown below?

(x+3)^2+(y-5)^2=8
(x+3)^2+(y-5)^2=64
(x-3)^2+(y+5)^2=64 **
(x-3)^2+(y+5)^2=8

Answer 7

am i right for #2?

Answer 8

yes! good job

Answer 9

so for number one to clarify how do i plug it in to find the answer

Answer 10

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

h = 5, k = 2, r =3

so just replace h with 5, k with 2, and r with 3

Answer 11

the equation of a circle is (x+8)^2+(y+9)^2=169. which of the following are the center and the radius of the circle
center=(-8,-9)
radius=13
center=(8,9) **
radius=13
center=(-8,-9)
radius=169
center=(8,9)
radius=169

Answer 12

basically the opposite of what we just did

Answer 13

just compare

(x+8)^2+(y+9)^2=169

with

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

to find the h, k, and r values

Answer 14

so, since (x+8) = (x-h) , h = -8, etc...

Answer 15

for the first one i got (x-5)^2+(y-2)^2=3^2

Answer 16

good, that's correct

Answer 17

just change 3^2 to 9

Answer 18

so for the 3 one would it be A then?

Answer 19

yes!

Answer 20

and for #1 its A right

Answer 21

yes (make sure both signs are negative)

Answer 22

the equation of a circle is (x-7)^2+y^2=225. which of the following are the center and the radius of the circle
center=(-7,0)**
radius=15
center=(7,0)
radius=15
center=(-7,0)
radius=225
center=(7,0)
radius225

Answer 23

not the first answer

Answer 24

(x - 7) = (x - h)

h = ?

Answer 25

a circle with center (-2,6) passes through the point (-2,10). which of the following equation of the circle?
(x-1)^2+(y-2)^2=36
(x+1)^2+(y+2)^2=17
(x-1)^2+(y-2)^2=17
(x+1)^2+(y+2)^2=36**

Answer 26

wait so what would 4 be again?

Answer 27

this one?


the equation of a circle is (x-7)^2+y^2=225. which of the following are the center and the radius of the circle

if x - 7 = x - h, then h = 7 and your x-coordinate is 7 not -7

Answer 28

oh poop i just realized for 5 i put the wrong choices

Answer 29

so for 4 its B right

Answer 30

good, yes

Answer 31

and ill re put the choices for 5 cuz i mixed them up

Answer 32

for this one,

a circle with center (-2,6) passes through the point (-2,10). which of the following equation of the circle?

there is one additional step

Answer 33

they don't give us the radius so we need to find it on our own

Answer 34

no extra step i just put wrong choices so give me a sec to re put