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

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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.

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