In a circle with centre $O$ , the central angle $∠ A O B = 8 0^{\circ}$ . What is the inscribed angle $∠ A C B$ on the major arc?

Practise more Plane Geometry.

Free questions with an explanation for every one, and full timed Junior Cycle (Ireland) mock tests.

All Plane Geometry questions Take a mock test

More Plane Geometry questions

A point $P$ is 17 units from the centre of a circle of radius 8. What is the length of a tangent from $P$ to the circle?
In a circle with centre $O$ , the central angle $∠ A O B = 7 0^{\circ}$ . What is the inscribed angle $∠ A C B$ on the major arc?
A point $P$ is 10 units from the centre of a circle of radius 6. What is the length of a tangent from $P$ to the circle?
Two angles of a triangle measure $4 7^{\circ}$ and $6 8^{\circ}$ . What is the size of the third angle?
Two parallel lines are cut by a transversal. One of the angles formed is $7 2^{\circ}$ . What is the size of the co-interior (allied) angle pair…
$A$ , $B$ and $C$ are points on a circle, and $[A B]$ is a diameter. If $∠ C A B = 3 5^{\circ}$ , find $∠ A B C$ .