Q1. In geometry, the midpoint is the middle or center point of a line segment. In the example given, point M bisects line AC, thus producing a pair of congruent sides AM and MC.
Q2. The reflexive property of congruence is used to prove congruence of geometric figures like triangles. This is used when a figure like angles and line segments is congruent to itself. Based on the example given, lines AB and BC and lines AM and MC.
Q3. An isosceles triangle is a triangle with two congruent sides. Congruent sides are lines AB and BC.
