leleedge1 leleedge1

16-07-2021
Mathematics

contestada

Find BC. PLEASE HELP ASAP!!
A. 28 in
B. 29 in
C. 30 in
D. 22.5 in

Find BC PLEASE HELP ASAP A 28 in B 29 in C 30 in D 225 in class=

Respuesta :

angrykai23 angrykai23

16-07-2021

Answer:

Choice B. 29

Step-by-step explanation:

Use law of cosines:

[tex]a^2=b^2+c^2-bcCosA[/tex]

[tex]a=\sqrt{b^2+c^2 -bcCosA}[/tex]

[tex]a=\sqrt{19^2+12^2-(19)(12)Cos138}[/tex]

[tex]a=29.0495[/tex]

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