# 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. Its opposite angles are equal. 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. ## 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. 