Circumference Angles

Circumference Angles

1. Central angle is the angle that has its vertex in the center of the circumference and the sides are radii of it. The measure of the arc AB is that of the central angle AOB. Arc AB = Angle AOB Arc AB = Angle AOB

2. Angle inscribed is one that has its vertex in the circumference The inscribed angle measures half of the arc it comprises.

3. Internal angle, has its center at an inner point of the circle. The measure of the interior angle is the average sum of the arcs that compose it and its opposite.

4. An exterior angle is one that has its vertex at an outer point of the circumference, the sides are tangent or secant. The measure of the external angle is the semidifference of the arcs that it covers.

5. Semi-Inscribed Angle: It is any angle that has its vertex on the circumference, one side is secant and the other is tangent to the circumference. Its measurement is equal to half the angle of the center that subtends the same arc.

6. Circumscribed Angle Its vertex is a point on the outside of the circumference. Its sides are two tangent lines. Its measure is the semidifference of the circumference arcs that cut its sides

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