This is a free lesson from our course in Geometry In this lesson you will learn how to construct Midpoint of a Line Segment and Inscribe a Circle in the given Triangle. It is explained by making use and of tools for basic construction and their application to build skills for higher concepts. The presentation covering such content will be done by the instructor in own handwriting, using video and with the help of several examples with solution.  (More text below video...)
Other useful lessons:
 Angle Bisectors and Perpendicular Bisectors Constructing Parallel and Perpendicular Lines
 (Continued from above) Constructing the midpoint of a segment - simply saying means, for constructing the midpoint of a line segment AB, you first draw the line segment and then draw arcs of the same radius centered at A and B respectively using compass. Then join the intersection points of the arcs i.e. C and D. Line CD bisects AB at point E, which is the midpoint of the line segment AB Given: line segment Construct: Midpoint of Procedure and steps of construction - draw line segment (Figure 1). - use the compass centered at point A and the radius exceeding half the length of AB. Draw two arc as shown in Figure 2. - keeping radius the same, now center the compass at point B and draw two arcs intersecting the earlier drawn arcs. Say these intersect at points P and Q - use the straightedge to draw line PQ, that intersects AB at point M. Conclusion: point M is the midpoint of line segment AB. Also line PQ is perpendicular to line segment AB. Construct a Circle in a given Triangle: Given: A triangle ABC Construct: A circle inscribed in ABC Procedure and steps of construction: - ABC is the given triangle (Figure 1). - construct the bisectors of A and B (Recall the procedure for angle bisector construction). The two angle bisectors intersect at Q (Figure 2). - construct a line through point Q, perpendicular to line segment AB. Let point P be the point of intersection.(Recall procedure for the construction of a perpendicular line through a given point.(Figure3). - using Q as the center point of compass, draw a circle through point P. The three sides of triangle i.e. AB, BC, CA will be tangent to the circle and hence circle inscribed in ABC.
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