Question

What is the standard form of the equation of the circle in the graph?

(x - 1)2 + (y - 2)2 = 16
(x - 1)2 + (y - 2)2 = 4
(x + 1)2 + (y + 2)2 = 16
(x + 1)2 + (y + 2)2 = 4

Answer 1

@jim_thompson5910

Answer 2

I think it is answer D

Answer 3

why D?

Answer 4

what's your thinking on it

Answer 5

because i thought that its positive 1 and 2 up

Answer 6

but i forget how to do this so i wasnt sure

Answer 7

this is a common mistake, the signs actually are flipped

Answer 8

since you have (x-h) and (y-k)

Answer 9

ohh

Answer 10

http://www.regentsprep.org/regents/math/algtrig/atc1/circlelesson.htm

Answer 11

so then would it be B?

Answer 12

what is the radius here

Answer 13

(1, 2)?

Answer 14

or 2?

Answer 15

it's the distance from center to edge of the circle

Answer 16

5

Answer 17

you miscounted

Answer 18

i know its 4 because 1^2*2^2= 4

Answer 19

oh then 4

Answer 20

r = 4 so r^2 = 16

Answer 21

in that link they have r^2 on the right side

not just r

Answer 22

ohh

Answer 23

its A then right?

Answer 24

yes