Aline tangent to a circle is perpendicular to the of the circle at the point of tangency.

a. radius
b. circumference
c. chord
d. center

The correct option is (A) radius.

Step-by-step explanation:  We are given to complete the following statement:

"A line tangent to a circle is perpendicular to the   ?   of the circle at the point of tangency."

We know that

A tangent line to a circle is a line intersecting the circle at exactly one point, called the point of tangency.

And the tangent line is perpendicular to the RADIUS of the circle at the point of tangency.

In the attached figure,

AB is a tangent line to a circle with centre 'O' and OC is the radius. Then AB will be perpendicular to OC at the point of tangency 'C'.

Thus, the complete statement is

A line tangent to a circle is perpendicular to the RADIUS of the circle at the point of tangency.

Option (A) is correct.

b.-4 units

all you   do is count how many times you move