Question

okay so i still cant solve this, can someone show me the steps please? a (-1,-7) and b(-10,-8) are the endpoints of a diameter of a circle. find the radius of the circle.

Answer 1

\[d=\sqrt{[-10-(-1)]^2+[-7-(-8)]^2}\]

Answer 2

\[d=\sqrt{81+1}\]

Answer 3

\[d=\sqrt{82}\]

Answer 4

That is the diameter.

Answer 5

divide by 2 to get the radius.

Answer 6

\[r=\frac{\sqrt{82}}{2}\]

Answer 7

thank you! :)

Answer 8

You'd better learn to use the distance formula. It shows up in all sorts of problems.