Question

Prove x2+y2=25 equation of a circle?

Answer 1

it is in the form of (x-h)^2 + (y-k)^2 = r^2

Answer 2

or just draw it :D

Answer 3

you could also, state that the center is (0,0) and the radius is 5

Answer 4

Solve √[(x - 0)^2 + (y - 0)^2] = 5.

This comes from the definition of a circle. The center is (0, 0) and the radius is 5, so the distance from any point on the circle (x,y) to the center is 5.

Answer 5

@zaibali.qasmi Yours thoughts are so similar :P
https://uk.answers.yahoo.com/question/index?qid=20100207094206AAmD62U

Answer 6

but why take the square root? this is already in standard form of a circle

Answer 7

yupp,,,i study it there an think it is simplest form to understand the asker..thats why..!!

Answer 8

what level of math is this? If it is geometry or algebra on a high school level, I would think stating that this is the standard form of a circle would suffice. If this is college level, then you more likely have to use proofs.
Just wondering....

Answer 9

It does say prove.

Answer 10

true but it is also, important to find out what level it is? sometimes justify, explain and prove are misuse on the high school or secondary level.

Answer 11

I see everyone's posting BUT keepsecure93 's, wonder why

Answer 12

because keepsecure93 is not online (perhaps)

Answer 13

well, his nick is

Answer 14

anyhow -> http://www.mathwarehouse.com/geometry/circle/images/equation-of-circle/example-2-equation-of-circle.png <--- surely you've covered this by now

Answer 15

DEAR MEMBERS.I AM A STUDENT OF 8THCLAS AND DIDNOT KNO MUCH ENGLISH .I COPY QUESTION FROM BOK

Answer 16

hmm that still doesn't exempt you from covering the material on circles or replying for that matter

Answer 17

Is the book a geometry or algebra?

Answer 18

geometry would want a proof
algebra probably just want you to recognize that this is standard form of a conic and that you can say, yes it is a circle with the center (0,0) radius 5

Answer 19

BASE GEOMETRY

Answer 20

likely just a match-up against the standard circle formula

Answer 21

well then I stand by my response

Answer 22

MNE 2SRA SWAL KESY POCHN