(a)[1]
Find the angle $BAC$.
(b)[2]
Find the angle $ABC$.
Mathematics 0580 · IGCSE · Circle theorems I
Circle theorems I — practice question
Points $A$, $B$ and $C$ lie on the circumference of a circle whose diameter is $AB$. A tangent has been drawn at $A$. The angle at $A$ between that tangent and line $AC$ is $42^\circ$. The diagram is NOT TO SCALE.