Question

Find A in degrees.
a = 11
b = 12
C = 20
B
A
N
A =[? ] degrees
Round to the nearest tenth.
Enter

Answer 1

Answer:

28.2°

Step-by-step explanation:

formula for an included angle (law of cosines)

$- \cos( \frac{ {a }^{2} + {b}^{2} - {c}^{2} }{2ab} )$

(the variables change depending on the question, this one is switched, for example...it is actually b squared+ c squared - a squared over 2(bc) in this case)

after you plug it all in, you get cos⁻¹(0.88125), and an answer to the nearest tenth of 28.2

If you found this answer helpful, I would greatly appreciate brainliest :D.