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5 terms

Area of a Circle

πr²

Circumference of a Circle

2πr or πd

Measure of an Angle on a Circle

½(measure of intercepted arc)

Measure of an Angle inside a Circle

½(measure of intercepted arc + measure of vertical angle's intercepted arc)

Measure of an Angle outside a Circle

½(measure of large intercepted arc - measure of small intercepted arc)