ANSWER
Center: (20,12)
Radius:23
EXPLANATION
The given circle has equation:

We complete the square as follows:





Comparing this equation to:

We have

representing the center and

being the radius.
Answer:
what do you need answers for
Step-by-step explanation:
Answer:
Angle ABC =40º.
Step-by-step explanation:
We know that angle ABD = 70º. We also know that angle CBD= 30º . Therefore angle ABD - angle CBD will give us the measurement of angle ABC. 70º - 30º= 40º.