The meaning of 'adjacent arcs' and how their arc lengths can be added.

The angle subtended by an arc at the center of the circle.

Definition and properties of an arc

Definition of arc length and formula to calculate it from the radius and central angle of the arc.

Peripheral angle: see 'inscribed angle'

Shows how a central angle can intercept or 'cut off' an arc

Difference between major and minor arcs. How they can be ambiguous.

Finding the radius of an arc or segment given its height and width.