Xét tam giác AIE BI/BA *PE /PI *SA /SE =1 =>PE =1/2PI S IPC /S IED = ( 1/2PI *IC *SİNPIC) /(1/2*EI *DI) =IP*IC /EI *DI =2/3*1/2=1/3
Xét tam giác AIE BI/BA *PE /PI *SA /SE =1 =>PE =1/2PI S IPC /S IED = ( 1/2PI *IC *SİNPIC) /(1/2*EI *DI*sinPIC) =IP*IC /EI *DI =2/3*1/2=1/3