Basic Shapes

In geometry we know basic shapes involve plane figures and solid figures.

Plane figure: The figures that lie in the plane are called plane figures.

For example, square, rectangle, triangle, diamond and circle. They are also called flat shapes.

Square: It has 4 sides and 4 corners. Area enclosed inside is called the square region.

Rectangle: It has 4 sides and 4 corners and the area enclosed inside is called the rectangular region.

Triangle: It has 3 sides and 3 vertices or corners. Area enclosed inside the triangle is called the triangular region.

Diamond: It has 4 sides and 4 corners and area enclosed is called the region of diamond.

Circle: It has no sides and no corners. Area enclosed inside the circle is called the circular region.


Difference between square and rectangle: Square has all sides equal and rectangle has opposite sides equal.


Region enclosed between the two circles:

If two circles cross each other

Area enclosed between the two circles is shown by the shaded region.

If one circle lies inside the other circle

Area enclosed between the two circles is shown by the shaded region.


Solid figures: We know, about some of the geometrical shapes like cuboid, cube, cylinder, cone, sphere, triangular prism, etc. These are called solid figures or solids. They are also known as three dimensional (3-D) figures. They occupy space. In real life many objects which are seen in our surroundings have the shape of any one or many of the solids mentioned above.

Third grade geometry lessons encourage the kids to develop the basic concept to increase the knowledge on geometry.

Surfaces of the solids: the two types of surfaces such as plane surfaces, curved surfaces.

Common solid figures: Some of the solid shapes such as cube, cuboid, cylinder, cone, sphere.

Related Concepts

Surfaces of the Solids

Common Solid Figures

Points, Lines and Shapes

Line-Segment, Ray and Line

Types of Lines

Geometrical Design and Models



3rd Grade Math Lessons

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