Projections of Plane Figures

  • K. Rathnam


A plane surface enclosed or bounded by straight lines or a curved line is called a plane figure. The least number of straight lines which can enclose a space is three. When three straight lines intersect, the plane surface enclosed is a triangle. With four straight lines, the figure obtained is a quadrilateral. The most common plane figures are set squares (30°–60° and 45°). Other common plane figures include square, rectangle, pentagon, hexagon, octagon, circle, ellipse, etc.

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© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  • K. Rathnam
    • 1
  1. 1.Annamalai UniversityCuddaloreIndia

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