Points (-3,-1) and (9,4) are endpoints of the diameter of a circle; radius the circle?

Question

I just need to know what equation to plug these numbers into. Thanks!

Answer 1

line tweem 2 points: (-3,-1) & (9,4) . . . deltax=12, deltay=5 . . . squarea: 144+25=169 . . distans=sq root(169)=13=diameter . . . radius=13/2=6.5

Answer 2

"Solution: Given points (-3,-1) and (9,4) are endpoints of the diameter of a circle
distance d=√(x1-x2)²+(y1-y2)²
d=√(-3-9)²+(-1-4)²
d=√169
d=13
there for radius r= diameter /2
r=13/2
radius=6.5"
Find the Radius of a Circle The radius of a circle can be obtained by measuring the line joining the center of a circle and its circumference.