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How to write the multiple-choice question 10 for the senior high school entrance examination in Shenzhen in 2006?
Don't listen to his nonsense Not 1/3.

choose one

Because the angle A is greater than 60 degrees (AB is only 60 degrees for 3 pairs, and AD is less than 60 degrees for 2 pairs).

So cosA is less than cos60 degrees.

So cosA is less than 1/2.

Then in the options, find less than 1/2.

only one

(Adopt me ...)