Digital ACT Math Practice Question #1287
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Shoelace from origin: $|6(8) - 4(2)| / 2 = (48 - 8)/2 = 20$.
Use the shoelace formula for a triangle with one vertex at the origin $(0, 0)$ and points $(x_1, y_1)$ and $(x_2, y_2)$: $$\text{Area} = \frac{1}{2}|x_1 y_2 - x_2 y_1|.$$ Substitute $(6, 2)$ and $(4, 8)$: $$\text{Area} = \frac{1}{2}|(6)(8) ...
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