Question 1043443
This needs to be drawn.
===================B
-
-
-
-25 deg----------------------85 deg
A======================C
Angle B has to be 70 deg.
Use Law of Sines
a/sin A=b/sin B=c/sin C
c/sin 85=20/sin 70
c=20 sin 85/sin 70=21.20 m