1. where is the circumcenter of a right triangle located?
a. inside the triangle
b. at a vertex of the triangle
c. on a side of the triangle
d. outside the triangle

2. what are the coordinates of this circumcenter of a triangle? (coordinates a(1, 1), b(1, -3), c(7, -3))

3. where is the incenter of an obtuse triangle located?
a. outside the triangle
b. on the triangle
c. inside the triangle
d. cannot be determined