Question

Help please and thanks

Answer 1

The radius = 3 units.

Explanation:

Ad and AB are both radii of the circle . Let each = r.

Using the Pythagoras theorem:

(r+2)^2 = r^2 + 4^2

r^2 + 4r + 4 = r^2 + 16

4r + 4 = 16

4r = 12

r = 3.