Answer:
C. 10.8
Step-by-step explanation:
The shortest distance from a line to a point is along a path at right angles to the line. That is, the segment marked 4 is a perpendicular bisector of the segment marked 20. Together with the radius (r), it makes a right triangle with legs 4 and 10. The Pythagorean theorem tells us ...
r² = 4² + 10²
r = √(16 +100) ≈ 10.77033
The radius of the circle is about 10.8 inches.
