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Let us learn how to construct a triangle if the following are given.
 
1. The base, vertical angle and the median on the base.
 
2. The base, vertical angle and the altitude on the base.
 
3. The base, vertical angle and the point on the base where the bisector of the vertical angle meets the base.
 
Let us consider the following construction.
Construction of a segment of a circle on a given line segment containing an angle \(\theta\)
5 Ресурс 1.png
 
Construction:
 
Step 1: Draw a line segment \(\overline{AB}\).
 
Step 2: At \(A\), make \(\angle BAC = \theta\). Draw \(AC\).
 
Step 3: Draw \(AD \perp AC\).
 
Step 4: Draw the perpendicular bisector of \(AB\) meeting \(AD\) at \(M\).
 
Step 5: With \(M\) as centre and \(MA\) as radius, draw a circle \(ABH\).
 
Step 6: Take any point \(N\) on the circle, by the alternate segments theorem, the major arc \(ANB\) is the required segment of the circle containing the angle \(\theta\).