Two. One in which C is acute and one where it is obtuse.
There are 6 such triples.
there are 27 triangles in a triangle
48 triangles
There are 15 triangles in a 17-agon
15 triangles
180
There are infinitely many answers and they comprise the coordinates of all points on the line that satisfy the equation.
There are 6 such triples.
There are infinitely many ordered pairs. One of these is (0, 0).
there are 27 triangles in a triangle
48 triangles
10.
It is the set of infinitely many ordered pairs, (x, y) such that the two satisfy the given equation.
There are 15 triangles in a 17-agon
15 triangles
15 triangles!!!!!!!!!!
no triangles