Maths – Other Geometric Plane Shapes



The principal geometric plane shapes are:
  • The Circle.
  • The Triangle.
  • The Rectangle.
  • The Rhombus.
  • The Square.
  • The Trapezium.

Maths – Other 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 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 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 trapezium also has 4 sides.  It has two sides that are parallel but the other 2 are not.

Learning resources

Example questions

  • Tell me the definition of a circle.
  • What does ‘diameter’ mean?
  • What is an arc?
  • What is a chord?
  • Tell me a fun fact about circles.
  • What is the name of a triangle whose sides are all of equal length?
  • What makes a triangle a scalene triangle?
  • Tell me about the angles in an acute-angled triangle.
  • What is the process of measuring using triangles called?
  • Other than the circle and the triangle, name two geometric plane shapes.

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