an example problem showed the following

Question

log tan A/2 = 9.54435 - 10
A= 38 deg 36' 12"

Now i want to do the same.

log tan A/2 = 9.85551 - 10
A= ??

I don't know how to convert tan into degrees can you help me.

Answer 1

log tan A/2 = 9.85551 - 10
log tan A/2 = - 0.14449
take inverse log
tan A/2 = 0.716984884
take inverse tangent
A/2 = 35.64
A = 71.28°
= 71° 16' 48"