Mathematics, 14.07.2019 02:00 AutumnGarringer
The vertices of a parallelogram are a(x1, y1), b(x2, y2), c(x3, y3), and d(x4, y4). which of the following must be true if parallelogram abcd is proven to be a rectangle? a. `((y_4-y_3)/(x_4-x_3)= (y_3-y_2)/(x_3-x_2))` and `((y_4-y_3)/(x_4-x_3)×(y_3-y_2)/(x_ 3-x_2))="-"1` b. `((y_4-y_3)/(x_4-x_3)= (y_2-y_1)/(x_2-x_1))` and `((y_4-y_3)/(x_4-x_3)×(y_2-y_1)/(x_ 2-x_1))="-"1` c. `((y_4-y_3)/(x_4-x_3)= (y_2-y_1)/(x_2-x_1))` and `((y_4-y_3)/(x_4-x_3)×(y_3-y_2)/(x_ 3-x_2))="-"1` d. `((y_4-y_3)/(x_4-x_3)= (y_3-y_1)/(x_3-x_1))` and `((y_4-y_3)/(x_4-x_3)×(y_2-y_1)/(x_ 2-x_1))="-"1`
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