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A helpful scientific calculator that runs in your web browser window.

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

Definition and properties of a sector - a pie-shaped part of a circle..

Gives examples of problems with intercepted arc, central angle, and angles inside and outside the circle.

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

Peripheral angle: see 'inscribed angle'

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

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

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

Definition and properties of an arc

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