Match each set of vertices with the type of triangle they form. A(2, 0), B(3, 2), C(5, 1)

obtuse scalene triangle

A(4, 2), B(6, 2), C(5, 3.73)

isosceles right triangle

A(-5, 2), B(-4, 4), C(-2, 2)

right triangle

A(-3, 1), B(-3, 4), C(-1, 1)

acute scalene triangle

A(-4, 2), B(-2, 4), C(-1, 4)

(One won't be used, I need to match each one up. This is from Plato. Anyone know? Please put it in terms that are easy to understand, someone else asked this and someone else gave an answer that I didn't understand, and I think they answered it wrong)