[{"text_idx": "#000000", "text": "Ffracsiynau, Degolion a Chanrannau (Mathemateg Canolradd)"}, {"text_idx": "#000001", "text": "Sector, Segment ac Arc (Mathemateg Uwch)"}, {"text_idx": "#000002", "text": "Rheol Sine a Cosine (Mathemateg Uwch)"}]