Pola → rekitangula
Tsopano mobwerera: r ikufanana ndi 14 ndipo theta ikufanana ndi madigiri 36. Nthawi ino mtunda ndi ngodya zikudziwika, ndipo x ndi y ndi zizindikiro za funso. Lembani 14, dinani 
ndi 
, kenako lembani 36. Dinani ndi 
, cholembedwa cha lalanje pamwamba pa batani la 9: x ndi 11.32623792. Dinani ndi 
kuti muone y: 8.228993532. Ndipo ndi kachiwiri zimabwerera ku x: 11.32623792.