Answer:
In a rhombus, the diagonals are perpendicular bisectors, and bisect opposite angles.
8a + 10 = (1/2)(10a + 62)
8a + 10 = 5a + 31
3a = 21
a = 7
Angle CBE measures 8(7) + 10 = 66°, so angle BCE measures 90° - 66° = 24°.
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