In parallelogram ABCD, the diagonals meet at point E. Find the lengths of the line segments AC and DE if AE = 7mm, BE = 8mm.

By the property of the parallelogram diagonals, at the intersection point, they are halved.

Then DE = BE = 8 mm.

AC = 2 * AE = 2 * 7 = 14 cm.

Answer: DE = 8 mm, AC = 14 mm.



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