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.

30 miles

step-by-step explanation:

we know that 60 seconds equals 1 minute and 60 minutes 1 hour

44 ft       60 sec     60 min     158400   ft

  *   *   =

1 sec       1 min       1 hour         hour

we know that there are 5280 ft per mile

158400   ft       1 mile         30 miles

  *   =

1   hour               5280 ft     1 hour

so in 1 hour   it can travel 30 miles

2/3

step-by-step explanation: