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Section 4

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• 1. 1.4 Angle Measure
• 2. Measure Angles
• A ray is part of a line. It has one endpoint and extends indefinitely in one direction.
• If you choose a point on a line, that point determines exactly two rays called opposite rays.
• An angle is formed by two noncollinear rays that have a common endpoints. The rays are called sides of the angle. The common endpoint is the vertex.
• 3. Example
• Name all the angles that have G as a vertex
• Name the sides of angle 5
• Write another name for angle 2
• 4. Classify Angles
• Right Angle:
• Acute Angle:
• Obtuse Angle:
• 5. Congruent Angles
• Angles that have the same measure are congruent angles. Arcs on the figures indicate which angles are congruent.