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Answer:
Step-by-step explanation:
In triangle DOA & triangle COB
AD=CB(GIVEN)
angleOAD = angleOBC (EACH 90)
AngleAOD = angleBOC (Vertically
opposite angles)
Therefore triangle DOA IS CONGRUENT TO triangleCOB BY SAA TEST
THEREFORE
OA=OB (CPCT)
THEREFORE CD BISECTS AB
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