Triangle from Angle Bisector, Altitude and Inradius

Construct $\Delta ABC,$ given angle bisector $l_a,$ altitude $h_a,$ and Inradius $r.$

Triangle from Angle Bisector, altitude and Inradius - problem

Construction

The construction is straightforward: start with $\Delta AL_{a}H_{a},$ then find the incenter $I$ on $AL_{a}$ at distance $r$ from $L_{a}H_{a}.$ This defines the incircle $(I)$ and the tangents from $A$ that give the vertices $B$ and $C.$

Acknowledgment

The construction was communicated to me by Prof. Dr. René Sperb.


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