In the diagram, the points $A$, $B$, $C$, $D$ lie on a circle centre $O$. Given that

Question

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 $\angle BAD$, $\angle BCD$, $\angle OBD$, $\angle ABO$.

Accepted Answer

(a) $50^\circ$; (b) $130^\circ$; (c) $40^\circ$; (d) $30^\circ$

Angle Properties of Circles: Theorems and Deductions

Angle Properties of Circles: Theorems and Deductions

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