U trokutu
![ABC](/media/m/a/c/7/ac75dca5ddb22ad70f492e2e0a153f95.png)
s kutom
![\angle BAC = 120^{\circ}](/media/m/9/c/c/9ccaeb68b8665912f4c7429abf7dfa77.png)
simetrale kutova
![\angle BAC](/media/m/b/2/1/b21a9e466104c5d33646432221e142be.png)
,
![\angle ABC](/media/m/c/9/2/c92dca0f4ca20d0ca087b59e09a26fa8.png)
i
![\angle BCA](/media/m/3/b/3/3b3cd106dd9b6fd647d1658303225769.png)
sijeku nasuprotne stranice u točkama
![D](/media/m/7/0/0/7006c4b57335ab717f8f20960577a9ef.png)
,
![E](/media/m/8/b/0/8b01e755d2253cb9a52f9e451d89ec11.png)
i
![F](/media/m/3/e/8/3e8bad5df716d332365fca76f53c1743.png)
redom. Dokažite da kružnica s promjerom
![\overline{EF}](/media/m/7/3/6/736526ec2c1c20572842175dc3523f2c.png)
prolazi kroz
![D](/media/m/7/0/0/7006c4b57335ab717f8f20960577a9ef.png)
.
%V0
U trokutu $ABC$ s kutom $\angle BAC = 120^{\circ}$ simetrale kutova $\angle BAC$, $\angle ABC$ i $\angle BCA$ sijeku nasuprotne stranice u točkama $D$, $E$ i $F$ redom. Dokažite da kružnica s promjerom $\overline{EF}$ prolazi kroz $D$.