Ng Khee Boon's answer to Gens's Primary 6 Maths Geometry Singapore question.

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Ng Khee Boon
Ng Khee Boon's answer
68 answers (A Helpful Person)
Ext angle of isos triangle ABC =62 degree = sum of 2 int. Opp. Angle . Hence Angle ABC = 62/2 = 31 degree.