Properties of shapes refers to the characteristics that define and describe different geometric shapes. These properties include the number of sides, angles, length of sides, and symmetry. Understanding these properties helps us identify and classify shapes.

For example:
- A triangle has 3 sides and 3 angles. The sum of its angles is always 180°.
- A square has 4 equal sides and 4 right angles (90°). It also has two lines of symmetry.
- A circle has no sides or corners, and every point on its boundary is equidistant from its center.

Examples:

Example 1: Classifying a Triangle
A triangle has sides of lengths 3 cm, 4 cm, and 5 cm.
This is a right triangle because the sides follow the Pythagorean theorem: 3² + 4² = 5².

Example 2: Properties of a Rectangle
A rectangle has:
- 4 sides (opposite sides are equal in length).
- 4 right angles (each angle is 90°).
- Two lines of symmetry (one horizontal, one vertical).
These properties make the rectangle distinct from other quadrilaterals like trapezoids.

Learning the properties of shapes allows us to solve problems in geometry, such as finding perimeters, areas, or identifying symmetry.

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