Find the missing parts of the triangle AB323 yd AC189 yd BC1

Find the missing parts of the triangle AB=323 yd AC=189 yd BC=164 yd

Solution

10)c=323,b=189,a=164

A=cos^-1[(b²+c²-a²)/(2bc)]

A=cos^-1[(189²+323²-164²)/(2*189*323)]

A=22.1^o

B=cos^-1[(a²+c²-b²)/(2ac)]

B=cos^-1[(164²+323²-189²)/(2*164*323)]

B=25.6^o

C=cos^-1[(a²+b²-c²)/(2ab)]

C=cos^-1[(164²+189²-323²)/(2*164*189)]

C=132.3^o

option c