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Geometric Plane Shapes: Circles, Triangles, Rectangles, Squares, and Trapezoids

What are geometric plane shapes? What characteristics do they have? These are the questions that we will answer in this post.

The principal geometric plane shapes are:

The Circle

Geometric Plane Shapes

The circle is a shape that can be made by tracing a curve that is always the same distance from a point that we call the center. The distance around a circle is called the circumference of the circle.

The Triangle

Geometric Plane Shapes

The triangle is a shape that is formed by 3 straight lines that are called sides. There are different ways of classifying triangles, according to their sides or angles.

  1. According to their angles:
  • Right triangle: the largest of the 3 angles is a right angle.
  • Acute Triangle: the largest of the 3 angles is an acute angle (less than 90 degrees).
  • Obtuse Triangle: the largest of the 3 angles is an obtuse angle (more than 90 degrees).

2. According to their sides:

  • Equilateral Triangle: all 3 sides are the same length.
  • Isosceles Triangle: it has 2 (or more) sides that are of equal length. (An equilateral triangle is also isosceles.)
  • Scalene Triangle: no 2 sides are of equal measure.

The Rectangle

Geometric Plane Shapes

The rectangle is a shape that has 4 sides. The distinguishing characteristic of a rectangle is that all 4 angles measure 90 degrees.

The Rhombus 

Geometric Plane Shapes

The rhombus is a shape formed by 4 straight lines. Its 4 sides measure the same length but, unlike the rectangle, any of all 4 angles measure 90 degrees.

The Square

Geometric Plane Shapes

The square is a type of rectangle, but also a type of rhombus. It has characteristics of both of these. That is to say, all 4 angles are right angles, and all 4 sides are equal in length.

The Trapezoid

Geometric Plane Shapes

The trapezoid also has 4 sides. It has two sides that are parallel but the other 2 are not.

You can practice with the geometric plane shapes by registering in Smartick.

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  • Kwabena Nyamekye Adjepong.Jun 02 2020, 10:42 AM

    Like the site.

  • GloryJun 02 2020, 7:19 AM

    Nice and easy to understand,my kids enjoyed it!!!

  • Ugwu DestinyMay 25 2020, 5:23 AM

    Thank you Mrs Mercy

  • Ugwu DestinyMay 25 2020, 5:17 AM

    Nice lesson,Thank you

  • Kelly SimpsonApr 24 2020, 9:01 AM

    Please can you put more shapes???!!!!!

  • Abeer MizanApr 15 2020, 3:50 AM

    thank you for the lesson!

  • AlinaSep 18 2019, 3:38 PM

    Thank the lord. I couldn’t tell the difference between square and trapezoid

  • HerobrineMay 13 2019, 1:04 AM

    Thank you for my lesson

  • Yola BingaliMar 28 2019, 11:16 AM


  • Sai KumarDec 22 2018, 11:24 AM

    2D square problem

    • NewcomerJan 17 2019, 1:54 PM

      There are other shapes worth considering.

  • AmnaFeb 17 2018, 3:32 AM

    I enjoyed learning different geometrical shapes

  • SanikaOct 28 2017, 9:58 AM

    You should tell more about each

    • HemanthJul 17 2019, 9:34 AM


  • divyaJul 09 2017, 9:09 AM

    example for square,triangle,circle,rectangle

    • Goodness okekeJun 24 2020, 8:24 AM

      Like it