Question

A circle whose center is at (6,8) passes through the

origin, Which of the following points is NOT on the

circle?

Answer 1

can u find the equation of circle ?

Answer 2

well

Answer 3

I use slope formula

Answer 4

8-0/6-0=8/6

Answer 5

what's the equation of a circle?

Answer 6

I forgot...

Answer 7

standard form :
(x-h)^2 + (y-k)^2 = r^2
centre = (h,k)
radius =r

Answer 8

ahh

Answer 9

so I could not just use distance formula?

Answer 10

nopes

Answer 11

well, its like distance formula except it has r squared in it

Answer 12

and no sq. root

Answer 13

64+64=128=r sq.

Answer 14

put (h,k)=(6,8) in that

Answer 15

sq. root 128

Answer 16

ahh

Answer 17

whose center is at 6,8

Answer 18

I thought the center was at the origin

Answer 19

64+64=r sq.

Answer 20

r= sq. root 128

Answer 21

right?

Answer 22

what next?

Answer 23

nopes, u did not put h,k = 6,8 in this.
(x-h)^2 + (y-k)^2 = r^2

Answer 24

yeah I did

Answer 25

(0-8) quantity squared=64

Answer 26

ahh

Answer 27

64+36=r sq.

Answer 28

r=10

Answer 29

l

Answer 30

k

Answer 31

so the radius equals 10

Answer 32

(10,0)?

Answer 33

or just 10?

Answer 34

so (16,8) is a possibility

Answer 35

so is (4,-8)

Answer 36

radius is 10, but i would say u still did NOT put h,k = 6,8 in
(x-h)^2 + (y-k)^2 = r^2

Answer 37

as well as (6,8)

Answer 38

I mean

Answer 39

(6,-2)

Answer 40

so we have two answers left, (12,0) and (-2,12)

Answer 41

where did I go wrong?

Answer 42

36+64=100

Answer 43

r=10

Answer 44

I plugged the numbers in the formula

Answer 45

can i request u something ?
please put h,k = 6,8 in
(x-h)^2 + (y-k)^2 = r^2

Answer 46

h=36

Answer 47

after quantity squared

Answer 48

k=64 quantity squared

Answer 49

wait a minute

Answer 50

ahh

Answer 51

(-2-8) sq. +(12-6) sq=r sq.

Answer 52

D. is incorrect

Answer 53

is that right?

Answer 54

let me put h,k = 6,8 in
and r=10
(x-h)^2 + (y-k)^2 = r^2

put h,k = 6,8 in
(x-6)^2 + (y-8)^2 = 10^2
did u get this ?

Answer 55

yeah

Answer 56

lol

Answer 57

r=10

Answer 58

D. is incorrect because r does not equal 10

Answer 59

so D. is the answer for the problem

Answer 60

ty for teaching me that formula

Answer 61

It will be useful for me in the future

Answer 62

yes, it will be
welcome :)