Question

HELP ASAP 80 POINTS!!!!!!!!!!

552 = 502 + 352 − 2(50)(35)cos(A)

After working through the problem above, we get cos(A) =

Answer 1

edg

Explanation:

Answer 2

`\large\boxed{\cos(A)\approx0.08629\to A=85^o}`

or

`\large\boxed{\cos(A)=0.2}`

Explanation:

`552 = 502 + 352-2(50)(35)\cos(A)\\\\552=854-3500\cos(A)\qquad\text{subtract 854 from both sides}\\\\-302=-3500\cos(A)\qquad\text{divide both sides by (-3500)}\\\\(-302)/(-3500)=\cos(A)\\\\\cos(A)\approx0.08629\\\\\text{From the table (look at the picture):}\\\\A=85^o`

If "2" are a square.

`55^2=50^2+35^2-2(50)(35)\cos(A)\\\\3025=2500+1225-3500\cos(A)\\\\3025=3725-3500\cos(A)\qquad\text{subtract 3725 from both sides}\\\\-700=-3500\cos(A)\qquad\text{divide both sides by (-3500)}\\\\(-700)/(-3500)=\cos(A)\to\cos(A)=(1)/(5)\to\cos(A)=0.2`