What is the radius of the circle?
4 squares = 16 units; therefore 1 square = 2 units
There diameter of the circle is 20 squares. There for the radius of the circle is 10 squares
note some of the simplification is omitted and is left for the reader to verify.
consider the upper left hand quadrant
consider the triangle
from the diagram it can be seen that
we have aright angled triangle and so apply Pythagoras' theorem
this simplifies to
this cannot be a solution as seen from the diagram