Kesebangunan Segitiga

$\frac{CD}{DA}=\frac{DE}{AB}$

$\frac{BE}{BC}=\frac{AB}{DE}$

$\frac{AD}{AC}=\frac{DE}{AB}$

$\frac{DE}{AB}=\frac{CE}{CB}$

$\frac{QT}{QP}=\frac{QS}{QR}$

$\frac{QS}{SP}=\frac{QT}{TR}$

$\frac{QT}{ST}=\frac{QP}{RP}$

$\frac{QT}{RT}=\frac{TS}{RP}$

$DF^2=FG\times GE$

$DE^2=GF\times GE$

$DG^2=GE\times GF$

$EF^2=ED\times FD$

$CB^2=CD\times CA$

$AB^2=BC\times CA$

$AC^2=AB\times CB$

$BD^2=BA\times BC$

$\frac{AB}{DE}=\frac{BC}{CD}$

$\frac{BC}{EC}=\frac{AC}{DC}$

$\frac{AC}{EC}=\frac{BC}{DC}$

$\frac{DE}{EC}=\frac{BA}{AC}$

$\frac{TQ}{QR}=\frac{PQ}{QS}$

$\frac{PR}{RQ}=\frac{QS}{ST}$

$\frac{PR}{TS}=\frac{PQ}{TQ}$

$\frac{TQ}{PQ}=\frac{QR}{QS}$

$\frac{QT}{QR}=\frac{ST}{RP}$

$\frac{QT}{QR}=\frac{QS}{QP}$

$\frac{QT}{RT}=\frac{QS}{PS}$

$\frac{QT}{QP}=\frac{TS}{PR}$

$\frac{BE}{BA}=\frac{BD}{BC}$

$\frac{BD}{BA}=\frac{BE}{BC}$

$\frac{BE}{BC}=\frac{DE}{CA}$

$\frac{ED}{AC}=\frac{BD}{BA}$

$EF=\frac{AB\times DE-DC\times AE}{AD}$

$EF=\frac{AE\times AB-DE\times DC}{AD}$

$EF=\frac{DC\times DE+AB\times AE}{AD}$

$EF=\frac{DE\times AB+AE\times CD}{AD}$

$\frac{ST}{SP}=\frac{SR}{PQ}$

$\frac{SR}{PQ}=\frac{RU}{RQ}$

$\frac{ST}{TP}=\frac{RU}{UQ}$

$\frac{SR}{TU}=\frac{TU}{PQ}$