Grade 10 Geometry Help!

Hello! I have no idea what I'm doing and want to toss myself out a window :D Mind helping????

Write an equation of a circle that contains each set of points.

a) a(–2, 2), B(2, –2), C(6, 2) b) R(5, 0), S–5, 0), T(0, –5)

Thank you so much, I am terrible at math and just want to pass this test.