In diamond ABCD, the angle B is equal to the angle EAF is equal to 60 degrees, the angle Bae is equal to 25 degrees, and the degree of the angle CEF is calculated

If you draw the picture and mark the angle energy, you will find that the triangle AFC and AEB are congruent (the number of three angles are equal, and a diagonal of the diamond is equal to the edge), AEC and AFD are congruent, so that the edge AE and AF are equal, then the triangle AEF is an equilateral triangle (the angle EAF is 60 degrees), so the angle CEF = angle CEA - the angle AEF = 85 degrees - 60 = 25 degrees
Then: the degree of CEF is 25 degrees
Use the angle of 60 degrees and 120 degrees of the diamond, angle and side of the particularity to solve, draw out the relevant line, and then use the congruent triangle, get the related edge is equal, angle is 60 degrees, get the equilateral triangle, so you can calculate the angle you want!

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