SOLUTION: The points (-3,-1) and (9,4) are the endpoints of the diameter of a circle. Find the length of the radiu of the circle. I have used the midpoint equation to get (3,3/2) as the

Question 483783: The points (-3,-1) and (9,4) are the endpoints of the diameter of a circle. Find the length of the radiu of the circle.
I have used the midpoint equation to get (3,3/2) as the mid point. So now I was using the standard equation of a circle to try an get the radius but I seem to be doing something wrong. The answer in my book says it is 6.5 but I keep getting 6.25 or 6.2. I would Rely like to see all the steps taken to get the answer. Can u help me?
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
Distance between ywo points (x1,y1) & (x2,y2)
is given by the formula

plug the values

d=13
so you know the radius now.
m.ananth@hotmail.ca
RELATED QUESTIONS
Let the points (-1, -2) and (-1, 3) be the endpoints of a circle. Find the length of the... (answered by MathLover1)

Points (1, 5) and (-7, 9) are endpoints of the diameter of a circle. What is the... (answered by ewatrrr)

points (-7,2) and (1,6) are endpoints of the diameter of a circle. What is the length of... (answered by tommyt3rd)

Let the points (-1,-2) and (-1,3) be the endpoints of a circle. Find the length of the... (answered by ikleyn)

The points (-3,-1) and (9,4) are the endpoints of the diameter of a circle. Find the... (answered by Alan3354)

Points (2,1) and (4,-7) are endpoints of the diameter of a circle. What is the length... (answered by ewatrrr)

Find the equation of the circle whose endpoints of the diameter are (-1, 1) and (3, 4) (answered by josgarithmetic)

Find the center of a circle whose diameter has the endpoints (5,7) and (-3,... (answered by Alan3354,macston)

The points (2, 5) and (4, �1) are endpoints of the diameter of a circle. (a) State... (answered by Fombitz)