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## Measuring Lengths & Angles

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**Measure of Segment AB**The length of AB is the absolute value of a-b. |a-b| or |b-a| A B a b**Congruence**• Objects that are congruent have the same measure**Segment Addition Postulate**If point R is between points P and Q, then RP + PQ = PQ P R Q**Angle Measure (using a protractor)**• Line up site with vertex • Line up one side with 0° • Read angle measure using other side**Angle Addition Postulate**If point S is in the interior of <PQR, then m<PQS + m<SQR = m<PQR P S Q R**Special Angle Sums**If the sum of the measures of two angle = • 90° => Complementary • 180° => Supplementary