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Section 4

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Section 4

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