6. Narysuj trójkąt ABC i oblicz jego
pole.
a) A = (3, 2), B = (7, 2), C = (3, 6)
b) A = (-2, 1), B = (0, 1), C = (0, 9)
c) A = (0, -2), B =(4,-2), C = (2, 2)