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Use parallelogram ABCD to answer the following. Diagonals BD and AC bisect at O.

1.measurement of angle BAD = 3y - 5
find angle BCD
2. AC = 12.8 cm
find OC

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Since we have a parallelogram, the opposite angles are equal, so BCD = 3y-5

Also, the diagonals bisect each other, so OC = 1/2 AC = 6.4cm

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