### Nia Mokhtar's answer to Luis Tan's Primary 6 Maths Geometry Singapore question.

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Firstly you have to find the value for OCD and ODC. Both are 54° (since they are isosceles).

Every straight lines = 180° in total.

Then find values for triangle AOD and BOC. Note that the interiour angles are defined by :-

(n-2) × 180° where n is the number of edges.

Every straight lines = 180° in total.

Then find values for triangle AOD and BOC. Note that the interiour angles are defined by :-

(n-2) × 180° where n is the number of edges.

Date Posted:
1 year ago

Triangle AOB is sadly not isosceles though.

Thank you brother