Answer:
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Step-by-step explanation:
∠BED is measuring 90 degrees (right angle).
The opposite angle of angle ∠BED will also be 90 degrees because of vertical angles.
∠AEC is measuring 90 degrees (right angle).
The angles on a line add up to 180 degrees.
∠AEC and ∠AEB add up to 180 degrees.
90 + ∠AEB = 180
∠AEB = 90
∠AEB is measuring 90 degrees (right angle).
Angles in a circle around the center add up to 360 degrees.
∠BED + ∠AEC + ∠AEB + ∠CED = 360
90 + 90 + 90 + ∠CED = 360
∠CED = 90
∠CED is measuring 90 degrees (right angle).
