I have a Pre-Calc question as following, the teacher on Brainly was able to help with the Part a, I need help with equations for b. Path from point 1 to 2 and Point 2 to 3.

Question: Lin is hiking nar a circular forest which is a perfect circle with a radius of 20 km. She starts at Point 1, which is 7 km North and 2 km West of northernmost point of the forest. She walks 6 km South of the sourthernmost point of the forest.

a. Draw a picture of the given situation, imposing a coordinate system and identify the location of all 3 points.

b. identify the equation that represents:
The outer edge of forest:

The path from point 1 to point 2:

the path from Point 2 to point 3: