Answer:
A = 78.46
Step-by-step explanation:
55^2 = 50^2 + 35^2 − 2(50)(35)cos(A)
3025 = 2500 + 1225 - 3500 cos A
- 3500 Cos A = -3725 + 3025
-3500 cos A = -700
cos A = -700/-3500
= 0.2
A = cos^-1 0.2
A = 78.46
Answer:
A=78.46° (to 4sf)
Step-by-step explanation:
The only way to approach this problem is to solve the equation.
55²=50²+35²-2(50)(35)cos(A)
3025=2500+1225-3500cosA
3025=3725-3500cosA
Now collecting like terms together:
3025-3725=-3500cosA
-700=-3500cosA
CosA=0.2
A=78.46° (to 4sf)
