Answer:
Set 2x+3 and 6x-57 equal to each other since both halves of The diagonal are equal length therefore equal measurement
Explanation:
x = 20
Diagonals bisect so you can set the two equal to each other
3x + 3 = 6x - 57
Solve:
3 = 3x - 57
60 = 3x
20 = x
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