Problem 96 of 7
Use the coordinate area formula on ordered vertices 10, 10; 20, 10; 15, 30.
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calculate area from ordered vertices.
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Vertices must be ordered around the triangle or rectangle.
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Solution
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1. List vertices in order and repeat the first vertex.
2. Compute the two diagonal sums.
3. Take half the absolute difference.
Use the worked steps, then substitute the final answer back into the original relationship to confirm it satisfies the prompt.
Negative area without taking absolute value.