Final answer:
The algebraic expression provided (2x+4)(2x-9) does not directly relate to vector angles without additional context. Without specific vector information or geometric context, it's impossible to find measures for angles A, B, and C.
Step-by-step explanation:
The question provided seems to contain components related to vector analysis, commonly found in physics or advanced mathematics. However, the expression given, (2x+4)(2x-9), appears to be algebraic and does not directly relate to vector angles without additional context. Typically, in vector analysis, the angle between two vectors can be found by using the dot product formula Ax Bx + Ay By + Az Bz and then taking the inverse cosine to find the angle. For direction angles, such as angle A in vectors, the angle is measured from the positive x-axis, adjusting by 180° if the vector lies in the second or third quadrant.
To find the measure of angles A, B, and C, specific vector information or geometric context is needed. Without this information, the expression (2x+4)(2x-9) cannot be used to identify any angles. For solving vector problems, one would typically identify the x- and y-components of each vector before using trigonometry to find angles and resultant vectors.
Given the incomplete nature of the question, it's not possible to provide measures for angles A, B, and C without additional information regarding vectors or geometric relationships.