It's very similar to the Segment Addition Postulate. m<ABC=m<ABD + m<DBC. An angle is a figure that's formed by two rays with a common endpoint called a vertex. (the vertex will always be in the center of your angle).
Ex:
m<ABD = 37 degrees and m<ABC = 84 degrees. Find m<DBC. It might help if you draw a picture. *Remember, BD bisects (or divides) <ABC*
m<ABC=m<ABD + m<DBC
84 degrees = 37 degrees + m<DBC
-37 -37
47 degrees = m<DBC
Now try one on your own:
m<XYZ = 121 degrees and m<XWY = 59 degrees. Find m<YWZ. Drawing a picture will help.
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Both state that the whole is equal to the sum of the component parts.
Angle side angle congruence postulate. The side has to be in the middle of the two angles
Its the Side, Angle, Side of a congruent postulate.
The SAS (Side-Angle-Side) postulate.
The A stands for angle.