Jawabanmu

2014-05-19T23:44:50+07:00
5.
AC diagonal bidang
AC=12 \sqrt{2}

AX= \sqrt{ AC^{2} + CX^{2} }  \\ AX =\sqrt{  (12\sqrt{2})^{2} + 6^{2} }  \\ AX= \sqrt{324}  \\ AX =18

sin XAC= \frac{6}{18} \\  =\frac{1}{3}

cos PXA= \frac{PX^2+XA^2-AP^2}{2.PX.XA} \\ = \frac{18^2+18^2-12^2}{2.18.18} \\ =   \frac{504}{648}  \\  =\frac{7}{9}

tan DBS= \frac{SD}{DB} \\ = \frac{12}{12 \sqrt{2} }   \\ = \frac{1}{ \sqrt{2} } \\ =  \frac{ \sqrt{2} }{2}