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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The Answer of 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°

Use Vectors to Find the Measure of the Angle at Vertex