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Math problems in the first grade of junior high school: comparison and operation of angles
180 degrees

Because ∠AOB+∠DOC=∠AOD+∠DOB+∠DOC(∠AOB split)

∠AOD+∠DOC=90 degrees

∠DOB=90 degrees

So ∠AOB+∠DOC=90+90= 180 degrees.

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