2.  Sounds scary, right?  Recall: › Postulate just refers to something so simple, it’s common sense in the math world. The addition postulates basically say that if a segment is made up of multiple segments, you can add the lengths of the smaller segments to equal the length of the long segment.

3.  The Segment Addition Postulate:  If three points A, B, and C are collinear and B is between A and C, then… AB + BC = AC

4. 1. Find AC. 2. Find AB. 3. Find BC. CBA 176 CBA 4.5 in.? CBA ?21 ft. ? 12 in. 59 ft. AC = 23 BC = 38 ft. AB = 7.5 in.

5. X = 5 TR = 12 X = 5 FN = 48

6.  The Angle Addition Postulate:  If point B is in the interior of ∠ AOC, then… m ∠ AOB + m ∠ BOC = m ∠ AOC

7. X = 1X = 10

8.  Addition is Hard! Addition is Hard!