Answer:
A. The third angle measures 30*
B. Two sides have the same length
The perimeter of a triangular field is 748 metres. The lengths of the three sides of the field are in the ratios 2 : 7 : 8. Calculate the length, in metres, of the largest side of the field.
=(864m)

Coefficient of x term is 10.
Can’t see a picture or can you send one so I can see the problem
The formula for arc length is...
arc length = radius • central angle