The radius is the distance from the center to any point. The distance from (2,1) to (0,1) is of course 2. The general formula for a circle with radius r and center (a,b) is

In our case we get
Answer:
12
Step-by-step explanation:
Answer:
C. These lines are perpendicular
Step-by-step explanation:
Answer:
Its -15 (B.)
Step-by-step explanation:
Just took the test and trying to help you out love.