15. A perpendicular bisector is a segment which divides another in half. Since JH is 9.8 then each of the two segments it divides into is 4.9.
17. The segments within the circle form a right angle. Triangle CRS as a right triangle must follow the Pythagorean theorem which says the square of each leg adds to the square of the hypotenuse.
The distance between town X and Town Y is equal to the difference between the distance between Town X and Town Z and the distance from Town Y and Town Z. Mathematically d (X-Y) = d (X-Z) - d(Y-Z) Substituting, d(X-Y) = 57 miles - 28 miles = 29 miles Thus, the distance from Town X to Town Y is 29 miles.
