Section 1-4 Measuring Angles and Segments. _______________________ What is the measure of segment DC? What is the measure of segment DE? What is the measure.

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Presentation transcript:

Section 1-4 Measuring Angles and Segments

_______________________ What is the measure of segment DC? What is the measure of segment DE? What is the measure of segment BC?

Postulate 1-5 The distance between any two points is the absolute value of the difference of the corresponding numbers AB | A – B |

Congruent Two segments with the same length are congruent.  Segment BC  DE is it the same as BC = DE

Segment Addition Postulate If three points A, B and C are collinear and b is between A and C, then AB + BC = AC

Angle Is formed by two rays with the same endpoint

Types of Angles Angles are measured in degrees Protractor – measures angles Acute Angle – degree measure between 0 and 90 degrees

Types of Angles Right Angle - measures exactly 90 degrees Obtuse Angle – measures between 90 and 180 degrees. Straight Angle – measures exactly 180 degrees

Angle Addition Posulate Ex:

Pg 30 #32

Homework pg evens #13, 28, 33-35