Current location - Education and Training Encyclopedia - Educational institution - (20 14? As shown in the figure, in the parallelogram ABCD, it is known that ∠ ODA = 90, AC = 26, BD= 10, and e and f belong to line segments OD and OA respectively.
(20 14? As shown in the figure, in the parallelogram ABCD, it is known that ∠ ODA = 90, AC = 26, BD= 10, and e and f belong to line segments OD and OA respectively.
∫ In the parallelogram, ABCD, ∠ ODA = 90, AC = 26, BD= 10,

∴AO=CO= 13,BO=DO=5，

So AD=AO2? DO2= 132？ 52= 12,

E and f are the midpoints of line segments OD and OA, respectively.

∴EF is the center line of △ADO,

∴EF∥. 12AD，

The length of EF is 6.

So the answer is: 6.

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