1. 
Calculate the area of the triangle with the following points: (4, 1), (1, 4), (1, 3)


2. 
Calculate the area of the triangle with the following points: (3, 4), (6, 7), (1, 8)


3. 
Calculate the area of the triangle with the following points: (7, 1), (2, 2), (1, 3)


4. 
Calculate the area of the triangle with the following points: (0, 1), (3, 0), (4, 2)


5. 
Calculate the area of the triangle with the following points: (8, 10), (3, 11), (5, 5)


6. 
Calculate the area of the triangle with the following points: (1, 8), (1, 4), (1, 7)


7. 
Calculate the area of the triangle with the following points: (0, 3), (6, 0), (1, 0)


8. 
Calculate the area of the triangle with the following points: (4, 3), (9, 2), (6, 0)


9. 
Calculate the area of the triangle with the following points: (4, 5), (5, 9), (0, 2)


10. 
Calculate the area of the triangle with the following points: (0, 2), (5, 8), (3, 0)


11. 
Calculate the area of the triangle with the following points: (2, 5), (1, 9), (2, 9)


12. 
Calculate the area of the triangle with the following points: (5, 0), (2, 5), (9, 4)

