Angle Properties of Circles: Theorems and Deductions
Angle Properties of Circles: Theorems and Deductions
TGM Original
In the diagram, the points \(A\), \(B\), \(C\), \(D\) lie on a circle centre \(O\).
Given that \(\angle BOD=100{}^\circ\) and \(\angle ADO=20{}^\circ\), calculate
- \(\angle BAD\),
- \(\angle BCD\),
- \(\angle OBD\),
- \(\angle ABO\).
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Answer:(a) \(50^\circ\) (b) \(130^\circ\) (c) \(40^\circ\) (d) \(30^\circ\)
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