Math 9 Circle Facts


AB is a diameter

O is the center

OM is a radius. So are OA and OB

The distance around, from A to B, is a semicircle

The full distance around is the circumference

Two points A and B on the circle define an arc AB
Lines from A and B to the center make a central angle C
Lines from A and B to the far side of the circle make an inscribed angle i

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