## BrittanyFrench 2 years ago please help! if the diamter of the circle has endpoints at (-2,4) and (3,8), what is the length of the radius of the circle?

1. cwrw238

find the length of the line joining the 2 points and divide the answer by 2

2. BrittanyFrench

Um, not really sure what that means

3. Argos

Find the distance between the points and divide by 2

4. BrittanyFrench

so that would bewhat around4ish

5. cwrw238

the formula for the length of a line joining (x1,y1) and (x2,y2) = sqrt [(x2-x1) ^2 + y2-y1)^2] which is the Pythagoras theorem

6. Argos

|dw:1357683394940:dw|

7. BrittanyFrench

ok well I got 2

8. Argos

|dw:1357683510146:dw|

9. ashlynn143

hope this helps Use the distance formula to find the length of the diameter between these two points. d = √[ (-2-3)^2 + (4-8)^2 ] d = √[ (-5)^2 + (-4)^2 ] d = √( 25 + 16 ) d = √( 41 ) = 6.40312424 = diameter. the radius is 1/2 the diameter. 6.40312424/2 = 3.20156212.

10. BrittanyFrench

wow.. Hopefully that's correct lol that looks about right! Thanks!

11. ashlynn143

anytime