Pt1420 Unit 1 Exercise 5 Analysis

Equation 4 represents the intersection area between two circles whether the circumference of each circle passes through the centre of the other one and vice versa. Equation 5 is used to the area between two circles. With Equation 6, we formulate the difference between a quarter circle area and a half of A1 area.
Equation 7 represents the 2-coverage area near the border line. We calculate A5, which is one of the exact 3-coverage areas, in Equation 8. The exact 4-coverage area is computed by using Equations 9.