Traditional Culture Encyclopedia - Photography and portraiture - How to do this math problem? Zhanjiang road. Thank you.
How to do this math problem? Zhanjiang road. Thank you.
Extend AD, BC, the intersection of two straight lines and point O.
∠∠A+∠B = 90
In delta AOB, delta AOB = 90.
That is, △AOB and △DOC are right triangles.
And point ∵N and point m are the midpoint of CD and AB, respectively.
Connect o point and m point, and at this time OM also passes through n point.
That is, om and on are the hypotenuse bisectors of △AOB and △DOC respectively.
∴OM=？ AB=5.5，，ON=？ DC=2.5 (Theorem, bisector of hypotenuse of right triangle = half of hypotenuse)
∴MN=OM-ON=3
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