Name the following angles of Fig. 2.29, using three letters:


(a) 1


(b) 2


(c) 3


(d) 1 + 2


(e) 2 + 3


(f) 1 + 2 + 3


(g) CBA – 1


(a) 1 = CBD


(b) 2= DBE


(c) 3 = EBA


(d) 1 + 2 = CBD + DBE


= CBE


(e) 2 + 3 = DBE + EBA


= DBA


(f) 1 + 2 + 3 = CBD + DBE + EBA


= CBA or ABC


(g) CBA - 1 = CBA - CBD


= DBA or ABD


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