(hite+10)*tan(25 deg)=hite*tan(45 deg)=hite
(hite+10)=hite / tan(25 deg)
tan(25 deg)=0.3838640350354158
1/tan(25 deg)=2.6050890649341505
so (hite+10)=2.605089...*hite
or (2.605089 -1)*hite=10
so hite=10/1.60508906493415...hite=0.6230183868720717*10
hite=6.230183868720717
or bout 6.23