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Answer: 65 degrees
Step-by-step explanation:
Bcoz only the size of angle has changed not the measure
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AO =OB(GIVEN)
ANGLE OAB=ANGLE OBA(ANGLES FORMED. AT EQUAL SIDES ARE EQUAL)
SUM=65+65=130 DEGREES
SUM OF ANGLES OF TRIANGLE=180 DEGREES
ANGLE AOB=180-130=50 DEGREES
ANGLE DOC=50 DEGREES(OPPOSITE ANGLES)
ANGLE DOC=ANGLE CDO(THEY ARE FORMED UNDER EQUAL SIDEA(SIMILAR TO FIRST PROOF))
180-50+50=ANGLE ODC
180-100=80 DEGREES
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