Use Vectors to Find the Measure of the Angle at Vertex

question 32

Multiple Choice

Use vectors to find the measure of the angle at vertex B of triangle ABC,when $A = ( 5,4 )$ , $B = ( - 2,4 )$ ,and $C = ( - 3 , - 4 )$ .Round answer to two decimal places.

• A)95.94°
• B)98.47°
• C)97.13°
• D)95.04°
• E)99.65°

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