In geometry, an isosceles triangle is a triangle that has two sides of equal length. Sometimes it is specified as having exactly two sides of equal length, and sometimes as having at least two sides of equal length, the latter version thus including the equilateral triangle as a special case. Against this pretext: a) Select a case b) Describe unexpected insight into the selected case. c) Distinguish right angle isosceles in the context of construction. d) Critique the parallel line theorem in the context of isosceles triangle. e) Investigate line drawing in the context of equilateral triangle.

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