Question

Find the equation of the circle whose center and radius are given.

center (0, 8), radius = 8

Answer 1

http://openstudy.com/updates/53a88adae4b0a819ab11866e

Answer 2

The equation for a circle is:

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

Where (h,k) is the center and r^2 is the radius.

Answer 3

You just plug in the numbers you have for (0,8) and radius of 8

Answer 4

ik but the answer as to be like this __+(___)_______

Answer 5

(x-0)^2+(y-8)^2=8^2

x^2+(y-8)^2=64.

When you have a 0 coordinate, it's just x^2 or y^2.

Answer 6

o thank u sooo much i have one more can u help?

Answer 7

Yeah sure!

Answer 8

Find the equation of the circle whose center and radius are given.

center ( -2, -5), radius = 1

Answer 9

This would be the same kind of thing. Plug it in:

(x-(-2)^2+(y-(-5)^2=1^2

Answer 10

What happens when you have this -(-)? What does it become?

Answer 11

a positive?

Answer 12

Good, so what would the equation be?

Answer 13

(x+2)^2+(y+5)^2=1

Answer 14

Yup!

Answer 15

omg thank u so much!!!!!! r u good with diagnols?

Answer 16

Hm it depends on the question lol

Answer 17

A parallelogram whose vertices have coordinates R(1, -1), S(6, 1), T(8, 5), and U(3, 3) has a shorter diagonal of ___ .

Answer 18

i have 3 answer to chose from

Answer 19

5
square root(13)
square root(97)

Answer 20

Well first thing I would do is graph the parallelogram

Answer 21

So I drew it and drew the diagonals. So to find the length of the diagonals we will use the distance formula with points

Answer 22

Use the formula with:

(3,3)(6,1)

and

(1,-1)(8,5)

Answer 23

Do you know what the distance formula is/how to use it?

Answer 24

yup! ill do it right now dont go nowhere though

Answer 25

I won't haha

I'll do it too

Answer 26

haha kk

Answer 27

so the first one i got square root 13 and the seond square root 185! i dont know how to reduce squareroots

Answer 28

Well it's asking for the shorter diagonal anyways.

And for the first one I got sqrt(5)

Answer 29

really!!? weird

Answer 30

And for the second I got sqrt(85)

Answer 31

Obviously the smaller one is sqrt(5)

Answer 32

haha ya thank u can u stick around im stuck on alot more!!!!! and u explain really good?

Answer 33

Oops my 1st one is wrong I'm sorry I wrote down (3,3) and it looked like (5,3) lol

Answer 34

ooo hahaha so u gunna redo it?

Answer 35

It is sqrt(13) lol

Answer 36

Which would be the answer because sqrt(13) is smaller than sqrt(85)

Answer 37

hahah thanks knew it heheh!!! ur a big help!!! will u help with more?

Answer 38

Sure I can! Open a new question though, this one is getting lengthy lol

Answer 39

hahaha ok!

Answer 40

Just tag me in your question :)