The figure below shows Quadrilateral CDBE inscribed in a circle with center A.

The paragraph proof with missing statement proves that its opposite angles are supplementary. Which statement can be used to fill in the blank space?

Given that CDBE is a quadrilateral inscribed in a circle with center A, ∡DCE and ∡DBE are inscribed angles. Since the measure of an inscribed angle is one-half the measure of its intercepted arc, ∡DCE is half of arc DBE and __________________________________________________. Since arc DBE and arc DCE add up to the whole circle, or 360 degrees, the tot

Question

The figure below shows Quadrilateral CDBE inscribed in a circle with center A. 

The paragraph proof with missing statement proves that its opposite angles are supplementary. Which statement can be used to fill in the blank space? 
  
Given that CDBE is a quadrilateral inscribed in a circle with center A, ∡DCE   and ∡DBE are inscribed angles. Since the measure of an inscribed angle is one-half the measure of its intercepted arc, ∡DCE  is half of arc DBE and  __________________________________________________.  Since arc DBE and arc DCE add up to the whole circle, or 360 degrees, the tot

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