Let
be an acute-angled triangle. Let
be a point such
and
are on distinct sides of the line
, and
is an interior point of segment
. We have
,
, and
. Prove that
,
and
lie on the same line.
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Let $ABC$ be an acute-angled triangle. Let $E$ be a point such $E$ and $B$ are on distinct sides of the line $AC$, and $D$ is an interior point of segment $AE$. We have $\angle ADB = \angle CDE$, $\angle BAD = \angle ECD$, and $\angle ACB = \angle EBA$. Prove that $B$, $C$ and $E$ lie on the same line.
Školjka