Cera krejza jo płona geometriska forma, młogosć dypkow, kótarychž zdalonosć wót srjejźišća jo jadnaka.
Tale zdalonosć groni se radius. Pśeměr jo nejwětšy zdalonosć mjazy dwěma dypkoma cery krejza, jo dwa raz wětšy ako radius. Definicija cery krejza koresponděrujo z njej kreslenim z pomocu kružydła.
Cera krejza k s radiusom r a
S w rowninje E:
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