# Construct Triangle by Angle, Altitude and Median

### What Might This Be About?

26 March 2015, Created with GeoGebra

### Problem

Construct $\Delta ABC,$ given $m_b,$ $h_a,$ and angle at $A.$

### Construction

**Step 1**: On a segment $AM_b$ of the given length $m_b$ construct circle $\kappa$ in which $AM_b$ sub tends the given angle at $A.$

**Step 2**: Draw circle $C(M_b,h_a/2)$ centered at $M_b$ with radius $h_a/2.$

**Step 3**: Draw tangent from $B$ to $C(M_b,h_a/2)$ away from $\kappa.$

**Step 4**: Draw a line parallel to the latter at distance $h_a.$ Obtain $A$ at the intersection with $\kappa.$

**Step 5**: Draw $AM_b$ to find $C.$

There may be $0, 1,$ or $2$ solutions:

### Acknowledgment

The construction is due to Prof. Dr. René Sperb.

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