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

**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

**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.

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**

● Geometrical Design and Models

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