23 Arc Addition Postulate: The measure of the arc formed by two adjacent arcs is the sum of the measures of the two arcs. In the figure to the right, because they are vertical angles. Two arcs that correspond to congruent central angles will also be congruent.G.CO.1 Know precise definitions of angle, circle, perpendicular line, parallel line, and line segment, based on the undefined notions of point, line, distance along a Identify special angle pairs and use their relationships to find angle measures. Angles 1-5 Exploring Angle Pairs Determine and compare the measures of angles.4.- Arcs and Angles Formed by Secants, and Tangents in a Circle: Segments that Give Place Secant and Tangents in Circles and the Angles and Arcs that They Form in the Circle Intersecting Inside, On or Outside the Circle. Inscribed and Central Angles: Problems that Focus in Inscribed and Central Angles Usings Triangles and Parallelograms.

1) three central angles 2) three minor arcs 3) three major arcs 4) one semi-circle Use the given diagram to find the measure of each arc or angle.

Practice Worksheet for Lesson 9-3 Name: Mailbox #: Use the given diagram to name the following for circle O.

Which angle is a right angle? 2.Draw a pair. Acute angle Right angle Obtuse angle Straight angle 08 < m∠ A < 908 m∠ A 5 908 908 < m∠ A < 1808 m∠ A 5 1808 GUIDED PRACTICE for Examples 1 and 2 1.Name all the angles in the diagram at the right.

CLASSIFYING ANGLES Angles can be classified asacute, right, obtuse, and straight, as shown below.

Video for lesson 9-3: Arcs and central angles of circles URL.

distance around a circular arc, angle, interior of an angle, angle bisector, midpoint, degree, zero and straight angle, right angle, perpendicular, equidistant Assessments Galileo: Geometry Module 1 Foundational Skills Assessment Live Binders/Galileo: Topic A Assessment Standard Common Core Standards Explanations & Examples Resources.

Inscribed angles and arcs worksheet