Please help :(

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.

Candy lives in the center of town. her friend darlene lives 28 miles to the east and her friend dana lives 21 miles north. approximately how far do dana and darline live apart ?

The difference between two numbers is one. three times the larger number minus two times the smaller number is 9. what are the two numbers