Help!! will give medal :)
A carpenter must ensure that a large window frame is a rectangle. If the corners are labled A,B,C, and D,the carpenter knows that AB=51in BC=68in CD=51in and AD=68in. The carpenter used a string to verify that the diagonals AC and BD are the same length, and so insists that ABCD must be a true rectangle. Finish the reasoning outlined below to justify the carpenters logic
ABCD is a rectangle since....

Question

Help!! will give medal :)
A carpenter must ensure that a large window frame is a rectangle. If the corners are labled A,B,C, and D,the carpenter knows that AB=51in BC=68in CD=51in and AD=68in. The carpenter used a string to verify that the diagonals AC and BD are the same length, and so insists that ABCD must be a true rectangle. Finish the reasoning outlined below to justify the carpenters logic
ABCD is a rectangle since....

anonymous · Answer

Since AB=DC and  BC=CD, diagonal AC should be equal to BD..|dw:1379726439088:dw|