## anonymous 4 years ago a (-1,-7) and b(-10,-8) are the endpoints of a diameter of a circle. find the radius of the circle. (step by step response please) :)

1. Mertsj

Use the distance formula to find the length of the diameter and divide it by 2. That will be the radius.

2. anonymous

how do you find the numbers to put in the distance formula?

3. Mertsj

They are given in the problem. x1=-1, y1=-7, x2=-10, y2=-8

4. anonymous

im sorry, im still confused ....

5. Mertsj

Do you know the distance formula?

6. anonymous

yes

7. Mertsj

What is it?

8. anonymous

-b$\sqrt{b^2-4AC}/2A$

9. anonymous

-b +/_

10. anonymous

well, you got the quadratic formula!

11. Mertsj

$d=\sqrt{(x _{2}-x _{1})^{2}+(y _{2}-y _{1})^2}$

12. Mertsj

Plug the numbers into that. Simplify and divide by 2. That will be the radius.

13. anonymous

ha whoops .... my bad i prob shouldn't watch the super bowl while attempting math... thank you!

14. Mertsj

Sounds like a plan. Who are you rooting for?

15. anonymous

the browns! haha

16. Mertsj

Go Browns

17. anonymous

here we go brownies here we go!!

18. anonymous

wait the answer comes out negative...

19. anonymous

The browns arent playing silly. It's the giants and patriots

20. anonymous

i know lol

21. anonymous

okay good