Question

Triangle XYZ is equilateral with m 11 years ago

Answer 1

have you plugged in the variables @GeoSlow

Answer 2

so you know what mean ,,equilateral" triangle ? so this mean 3 equal sides so 3 equal angles what mean that the measure of an angle will be equal 60 degree

than now just make

60=3a+4 ---- 56=3a --- a= 56/3 --- a= 18,6
60=6b --- b = 10
60=19c+3 --- c = 57/19 --- c = 3

hope so much this will help you