Measure and classify Angles

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Presentation transcript:

Measure and classify Angles Geometry Section 1.4 Measure and classify Angles

Terms Angle consists of two different rays with the same endpoint vertex side

To name angles, either name with 3 points (point at the vertex in the middle), or name with the vertex point. See mimio example To measure use protractor

Classifying angles Acute angle measures more than 0 degrees, but less than 90 degrees Right angle measures 90 degrees Obtuse angle measures more than 90 degrees but less than 180 degrees Straight angle measures 180 degrees

Angle Addition Postulate If P is in the interior of angle RST, then the measure of angle RST is equal to the sum of angle PST and angle RST See mimio example

Examples Page 29 Problems #23, 25

Terms Two angles are congruent if they have the same measure Angle bisector is a ray that divides an angle into two angles that are congruent

Examples Page 30 Problem 41

Assignment Section 1.4 Page 28 Problems # 4, 8 – 40 even, 56 - 60