(a)[1]
Work out $x$.
(b)[1]
Work out $y$.
(c)[1]
Work out $z$.
(d)[1]
Work out $t$.
Mathematics 4024 · O Level · Circle theorems II
Circle theorems II — practice question
On the diagram, $A,B,C,D$ are on the circle with centre $O$. $AD$ is a diameter. The tangent at $B$ to the circle intersects the extension of line $DA$ at $T$. $\angle A\hat{O}B=68^\circ$ and $\angle C\hat{A}O=43^\circ$.