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Find 10 math and geometry application problem in the first grade of junior high school! ! ! ! ! ! !
Fold one corner of the rectangular paper so that the vertex A falls at F and BC is the crease. If BE is the bisector of ∠FBD, find ∠CBE.

Answer: BC is a crease, ∴∠CBF= 1/2∠ABF.

∫∠FBE = 1/2 FBD，

∴∠cbe=∠cbf+∠fbe= 1/2(∠abf+∠fbd)= 1/2* 180 = 90

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