Question

CAN SOMEONE PLS HELP ME PLS

Answer 1

Answer:

Firstly, we can look at our givens,

a = 17

b = 22

c = 30

And we are looking for m∠A

a^2=b^2 +c^2 -2bc (cosA)a

2

=b

2

+c

2

−2bc(cosA) Is the Law of Cosines. Now we can solve for our unknown, m∠A. This will give us

A = cos^{-1} (\frac{-a^2+b^2+c^2}{2bc})A=cos

−1

(

2bc

−a

2

+b

2

+c

2

)

Now we can substitute in our given variables.

A= cos^{-1} (\frac{-(17^2)+27^2+30^2}{2(27)(30)} )A=cos

−1

(

2(27)(30)

−(17

2

)+27

2

+30

2

)

Then we can plug this into our calculator which will give us

34.19185257 degrees

Now we just have to round to the nearest tenth

This means that the answer is 34.2 degrees