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What is the area of a rectangle with vertices at (−3, −1) , (1, 3) , (3, 1) , and (−1, −3) ? Enter your answer in the box. Do not round any side lengths.

Respuesta :

budwilkins
Area (a) = length (l) × width (w), so we need the distance formula between 2 points for each one width and one length:
[tex]d = \sqrt{{(y2 - y1)}^{2} + {(x2 - x1)}^{2} }[/tex]
[tex]w = \sqrt{{(1 - 3)}^{2} + {(3 - 1)}^{2} } \\ = \sqrt{( {( - 2)}^{2} + {(2)}^{2})} = \sqrt{4 + 4} \\ = \sqrt{8} \: = [/tex]
[tex]l = \sqrt{({(3 - - 1)}^{2} + {(1 - - 3)}^{2})} \\ = \sqrt{({(3 + 1)}^{2} + {(1 + 3)}^{2})} \\ = \sqrt{({(4)}^{2} + {(4)}^{2})} \\ = \sqrt{({16} + {16})} \: = \sqrt{32} [/tex]
[tex]a \: = l \times w = \sqrt{32} \times \sqrt{8} \\ = \sqrt{256} = 16 \: {units}^{2} [/tex]

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