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12 cards from this deck
12∣x1y2−x2y1∣\frac{1}{2}|x_1y_2 - x_2y_1|21∣x1y2−x2y1∣
Absolute value
When one vertex is at origin (0,0)
Multiply x1x_1x1 by y2y_2y2 and x2x_2x2 by y1y_1y1
Find difference between products
To ensure area is always positive
Multiply by 12\frac{1}{2}21
Translate triangle so one vertex moves to (0,0)
No
Yes, result will be same
Forgetting to take absolute value
Forgetting to multiply by 12\frac{1}{2}21
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