Solve the triangle. Round lengths to the nearest tenth and angle measures to the nearest degree. a = 7, b = 7, c = 5

A. A = 70°, B = 70°, C = 40°
B. A = 69°, B = 69°, C = 42°
C. A = 42°, B = 69°, C = 69°
D. A = 69°, B = 42°, C = 69°

Question

Solve the triangle. Round lengths to the nearest tenth and angle measures to the nearest degree. a = 7, b = 7, c = 5

A. A = 70°, B = 70°, C = 40°	
B. A = 69°, B = 69°, C = 42°	
C. A = 42°, B = 69°, C = 69°	
D. A = 69°, B = 42°, C = 69°

anonymous · Answer

Do you know the Law of Cosines?

anonymous · Answer

i'm researching about it now, but no i don't.

anonymous · Answer

This is just another formula. Into this formula, you can just plug in the 3 sides, and out will pop an angle. Then you can use the Law of Sines which will be easier to find the second angle, and then the fact that a triangle has 180 degrees total to find the last angle.