Question

The points ​(-1​,-4​) and ​(2​,6​) are the endpoints of the diameter of a circle. find the length of the radius of the circle.

Answer 1

Use the distance formula just like you would to find the length of any segment in a coordinate plane.
`d= \sqrt{( x_(2)- x_(1)) ^(2) +( y_(2) - y_(1)) ^(2) }`. Our formula filled in with our variables looks like this:
`d= \sqrt{(2-(-1)) ^(2)+(6-(-4)) ^(2) }` which gives you
`√(109) =10.44`