Answer:
A = 38°
Step-by-step explanation:
We are going to use cosine law to find angle A where
a = 4.7
b = 3.9 m
c = 2.9 m
[tex] {c}^{2} = {a}^{2} + {b}^{2} - 2ab \cos( \alpha ) [/tex]
or
[tex] \cos( \alpha ) = \frac{ {a}^{2} + {b}^{2} - {c}^{2} }{2ab} [/tex]
cos A = [(4.7)^2 + (3.9)^2 - (2.9)^2]/2(4.7)(3.9)
= 28.89/36.66
= 0.788
A = arccos(0.788) = 38°
