Use Vectors to Find the Measure of the Angle at Vertex

question 104

Multiple Choice

Use vectors to find the measure of the angle at vertex $B$ of triangle $A B C$ , when $A = ( 6,1 ) , B = ( - 1,3 )$ , and $C = ( - 4 , - 5 )$ . Round answer to two decimal places.

• A) \(92.52\)
• B) \(94.61 ^ { \circ }\)
• C) \(95.95\)
• D) \(93.42\)
• E) \(97.13 ^ { \circ }\)

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Definitions:

Reactivity

The alteration of the behavior of study participants due to their awareness of being observed.

Interval Scale

A type of scale used in measurements that expresses the order of variables and also establishes a defined distance between variables, but lacks a true zero point.

Ordinal Scale

A scale of measurement where objects or individuals are categorized based on some order or ranking, without information on the magnitude of differences.

Variable

Any event, situation, behavior, or individual characteristic that varies—that is, has at least two values.