tanB=cosDAC
AD/BD=AD/AC
BD=AC
sinC=12/13=AD/AC cosC=5/13=CD/AC=CD/BD
BC=12=BD+DC BD=26/3,CD=10/3
AC=26/3
AD=AC*12/13=(26/3)*(12/13)=8
tanB=cosDAC
AD/BD=AD/AC
BD=AC
sinC=12/13=AD/AC cosC=5/13=CD/AC=CD/BD
BC=12=BD+DC BD=26/3,CD=10/3
AC=26/3
AD=AC*12/13=(26/3)*(12/13)=8