Answer:
101
Step-by-step explanation:
According to the Law of Cosines, for any △ABC with side lengths a, b, and c, a2=b2+c2−2bccosA; b2=a2+c2−2accosB; and c2=a2+b2−2abcosC
.
The Law of Cosines can be used because all three side lentghs are known.
Set up the equation for the Law of Cosines:
a2=b2+c2−2bccosA
Substitute the known values into the Law of Cosines:
312=222+182−2(22)(18)cosA
Square the values and multiply:
961=484+324−792cosA
Add:
961=808−792cosA
Subtract 808
from both sides:
153=−792cosA
Divide both sides by −792
:
153−792=cosA
According to this equation m∠A
is equal to the inverse cosine function of −153792
. Write this:
m∠A=cos−1(−153792)
Calculate the value of the inverse cosine −153792
on a calculator:
m∠A≈101°
Therefore, m∠A≈101°
.
14.1
idk if i'm 100% right but i think its right
Answer:
D
Step-by-step explaination:
Thank you for posting your question here at brainly. Feel free to ask more questions.
<span>The x-coordinate of the solution to this system of equations shown below is x = 2 .</span><span>
</span><span>
Hope my answer would be a great help for you.</span>
Answer:
(-4,3)
Step-by-step explanation:
G is plotted 4 units left and 3 units up
:) ur welcome
